diff --git a/material/rest-api-ui-ktor-quiz-collector/build.gradle.kts b/material/rest-api-ui-ktor-quiz-collector/build.gradle.kts
index 9fb8aa95..21a817d3 100644
--- a/material/rest-api-ui-ktor-quiz-collector/build.gradle.kts
+++ b/material/rest-api-ui-ktor-quiz-collector/build.gradle.kts
@@ -35,6 +35,7 @@ dependencies {
     implementation(libs.ktor.server.netty)
     implementation(libs.logback.classic)
     implementation(libs.ktor.server.config.yaml)
+    implementation(libs.kandy.lets.plot)
     testImplementation(libs.ktor.server.test.host)
     testImplementation(libs.kotlin.test.junit)
 }
diff --git a/material/rest-api-ui-ktor-quiz-collector/gradle/libs.versions.toml b/material/rest-api-ui-ktor-quiz-collector/gradle/libs.versions.toml
index 191dc865..1500c9d3 100644
--- a/material/rest-api-ui-ktor-quiz-collector/gradle/libs.versions.toml
+++ b/material/rest-api-ui-ktor-quiz-collector/gradle/libs.versions.toml
@@ -22,6 +22,7 @@ logback-classic = { module = "ch.qos.logback:logback-classic", version.ref = "lo
 ktor-server-config-yaml = { module = "io.ktor:ktor-server-config-yaml", version.ref = "ktor-version" }
 ktor-server-test-host = { module = "io.ktor:ktor-server-test-host-jvm", version.ref = "ktor-version" }
 kotlin-test-junit = { module = "org.jetbrains.kotlin:kotlin-test-junit", version.ref = "kotlin-version" }
+kandy-lets-plot = { module = "org.jetbrains.kotlinx:kandy-lets-plot", version = "0.7.0" }
 
 [plugins]
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin-version" }
diff --git a/material/rest-api-ui-ktor-quiz-collector/result-explorer/demo01.ipynb b/material/rest-api-ui-ktor-quiz-collector/result-explorer/demo01.ipynb
index ca9a8e5a..6e2ee463 100644
--- a/material/rest-api-ui-ktor-quiz-collector/result-explorer/demo01.ipynb
+++ b/material/rest-api-ui-ktor-quiz-collector/result-explorer/demo01.ipynb
@@ -12,8 +12,8 @@
      "languageId": "python"
     },
     "ExecuteTime": {
-     "end_time": "2024-08-24T10:23:18.959803600Z",
-     "start_time": "2024-08-24T10:23:13.328613100Z"
+     "end_time": "2024-08-24T11:14:19.583192900Z",
+     "start_time": "2024-08-24T11:14:12.242893300Z"
     }
    },
    "source": [
@@ -23,7 +23,7 @@
     "%use dataframe"
    ],
    "outputs": [],
-   "execution_count": 90
+   "execution_count": 100
   },
   {
    "metadata": {},
@@ -33,8 +33,8 @@
   {
    "metadata": {
     "ExecuteTime": {
-     "end_time": "2024-08-24T10:23:19.179801200Z",
-     "start_time": "2024-08-24T10:23:18.975805100Z"
+     "end_time": "2024-08-24T11:14:19.925191Z",
+     "start_time": "2024-08-24T11:14:19.603194600Z"
     }
    },
    "cell_type": "code",
@@ -46,7 +46,7 @@
     {
      "data": {
       "text/html": [
-       "            <iframe onload=\"o_resize_iframe_out_75()\" style=\"width:100%;\" class=\"result_container\" id=\"iframe_out_75\" frameBorder=\"0\" srcdoc=\"        &lt;html theme='dark'&gt;\n",
+       "            <iframe onload=\"o_resize_iframe_out_84()\" style=\"width:100%;\" class=\"result_container\" id=\"iframe_out_84\" frameBorder=\"0\" srcdoc=\"        &lt;html theme='dark'&gt;\n",
        "        &lt;head&gt;\n",
        "            &lt;style type=&quot;text&sol;css&quot;&gt;\n",
        "                :root {\n",
@@ -224,7 +224,7 @@
        "            &lt;&sol;style&gt;\n",
        "        &lt;&sol;head&gt;\n",
        "        &lt;body&gt;\n",
-       "            &lt;table class=&quot;dataframe&quot; id=&quot;df_1241514132&quot;&gt;&lt;&sol;table&gt;\n",
+       "            &lt;table class=&quot;dataframe&quot; id=&quot;df_1241514150&quot;&gt;&lt;&sol;table&gt;\n",
        "\n",
        "&lt;p class=&quot;dataframe_description&quot;&gt;DataFrame: rowsCount = 2, columnsCount = 10&lt;&sol;p&gt;\n",
        "\n",
@@ -515,21 +515,21 @@
        "{ name: &quot;&lt;span title=&bsol;&quot;What tooling supports Kotlin Multiplatform development?: String&bsol;&quot;&gt;What tooling supports Kotlin Multiplatform development?&lt;&sol;span&gt;&quot;, children: [], rightAlign: false, values: [&quot;IntelliJ IDEA&quot;,&quot;IntelliJ IDEA, Android Studio&quot;] }, \n",
        "{ name: &quot;&lt;span title=&bsol;&quot;What is the benefit of using Kotlin Multiplatform for mobile development?: String&bsol;&quot;&gt;What is the benefit of using Kotlin Multiplatform for mobile development?&lt;&sol;span&gt;&quot;, children: [], rightAlign: false, values: [&quot;and sharing&quot;,&quot;Code reuse and sharing&quot;] }, \n",
        "{ name: &quot;&lt;span title=&bsol;&quot;How does Kotlin Multiplatform differ from Kotlin Native and Kotlin&sol;JS?: String&bsol;&quot;&gt;How does Kotlin Multiplatform differ from Kotlin Native and Kotlin&sol;JS?&lt;&sol;span&gt;&quot;, children: [], rightAlign: false, values: [&quot;None&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;Kotlin Multiplatform allows sharing code between different platforms using common modules.&bsol;&quot;&gt;Kotlin Multiplatform allows sharing c&lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;] }, \n",
-       "], id: 1241514132, rootId: 1241514132, totalRows: 2 } ) });\n",
+       "], id: 1241514150, rootId: 1241514150, totalRows: 2 } ) });\n",
        "&sol;*--&gt;*&sol;\n",
        "\n",
-       "call_DataFrame(function() { DataFrame.renderTable(1241514132) });\n",
+       "call_DataFrame(function() { DataFrame.renderTable(1241514150) });\n",
        "\n",
        "\n",
        "        &lt;&sol;script&gt;\n",
        "        &lt;&sol;html&gt;\"></iframe>\n",
        "            <script>\n",
-       "                function o_resize_iframe_out_75() {\n",
-       "                    let elem = document.getElementById(\"iframe_out_75\");\n",
-       "                    resize_iframe_out_75(elem);\n",
-       "                    setInterval(resize_iframe_out_75, 5000, elem);\n",
+       "                function o_resize_iframe_out_84() {\n",
+       "                    let elem = document.getElementById(\"iframe_out_84\");\n",
+       "                    resize_iframe_out_84(elem);\n",
+       "                    setInterval(resize_iframe_out_84, 5000, elem);\n",
        "                }\n",
-       "                function resize_iframe_out_75(el) {\n",
+       "                function resize_iframe_out_84(el) {\n",
        "                    let h = el.contentWindow.document.body.scrollHeight;\n",
        "                    el.height = h === 0 ? 0 : h + 41;\n",
        "                }\n",
@@ -690,21 +690,21 @@
        "            </style>\n",
        "        </head>\n",
        "        <body>\n",
-       "            <table class=\"dataframe\" id=\"static_df_1241514133\"><thead><tr><th class=\"bottomBorder\" style=\"text-align:left\">What is the primary goal of Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform facilitate code sharing between platforms?</th><th class=\"bottomBorder\" style=\"text-align:left\">Which platforms does Kotlin Multiplatform support?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is a common use case for Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is a shared code module in Kotlin Multiplatform called?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform handle platform-specific implementations?</th><th class=\"bottomBorder\" style=\"text-align:left\">What languages can be interoperable with Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">What tooling supports Kotlin Multiplatform development?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is the benefit of using Kotlin Multiplatform for mobile development?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?</th></tr></thead><tbody><tr><td  style=\"vertical-align:top\">To share</td><td  style=\"vertical-align:top\">By sharing business logic and adaptin<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">Android, iOS, and web</td><td  style=\"vertical-align:top\">Developing a cross-platform app</td><td  style=\"vertical-align:top\">Shared module</td><td  style=\"vertical-align:top\">actual</td><td  style=\"vertical-align:top\">Java, Swift</td><td  style=\"vertical-align:top\">IntelliJ IDEA</td><td  style=\"vertical-align:top\">and sharing</td><td  style=\"vertical-align:top\">None</td></tr><tr><td  style=\"vertical-align:top\">To share code between multiple platforms</td><td  style=\"vertical-align:top\">By sharing business logic and adaptin<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">Android, iOS, and web</td><td  style=\"vertical-align:top\">Developing a cross-platform app</td><td  style=\"vertical-align:top\">Shared module</td><td  style=\"vertical-align:top\">Through expect and actual declarations</td><td  style=\"vertical-align:top\">Java, JavaScript, Swift</td><td  style=\"vertical-align:top\">IntelliJ IDEA, Android Studio</td><td  style=\"vertical-align:top\">Code reuse and sharing</td><td  style=\"vertical-align:top\">Kotlin Multiplatform allows sharing c<span class=\"structural\">...</span></td></tr></tbody></table>\n",
+       "            <table class=\"dataframe\" id=\"static_df_1241514151\"><thead><tr><th class=\"bottomBorder\" style=\"text-align:left\">What is the primary goal of Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform facilitate code sharing between platforms?</th><th class=\"bottomBorder\" style=\"text-align:left\">Which platforms does Kotlin Multiplatform support?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is a common use case for Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is a shared code module in Kotlin Multiplatform called?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform handle platform-specific implementations?</th><th class=\"bottomBorder\" style=\"text-align:left\">What languages can be interoperable with Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">What tooling supports Kotlin Multiplatform development?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is the benefit of using Kotlin Multiplatform for mobile development?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?</th></tr></thead><tbody><tr><td  style=\"vertical-align:top\">To share</td><td  style=\"vertical-align:top\">By sharing business logic and adaptin<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">Android, iOS, and web</td><td  style=\"vertical-align:top\">Developing a cross-platform app</td><td  style=\"vertical-align:top\">Shared module</td><td  style=\"vertical-align:top\">actual</td><td  style=\"vertical-align:top\">Java, Swift</td><td  style=\"vertical-align:top\">IntelliJ IDEA</td><td  style=\"vertical-align:top\">and sharing</td><td  style=\"vertical-align:top\">None</td></tr><tr><td  style=\"vertical-align:top\">To share code between multiple platforms</td><td  style=\"vertical-align:top\">By sharing business logic and adaptin<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">Android, iOS, and web</td><td  style=\"vertical-align:top\">Developing a cross-platform app</td><td  style=\"vertical-align:top\">Shared module</td><td  style=\"vertical-align:top\">Through expect and actual declarations</td><td  style=\"vertical-align:top\">Java, JavaScript, Swift</td><td  style=\"vertical-align:top\">IntelliJ IDEA, Android Studio</td><td  style=\"vertical-align:top\">Code reuse and sharing</td><td  style=\"vertical-align:top\">Kotlin Multiplatform allows sharing c<span class=\"structural\">...</span></td></tr></tbody></table>\n",
        "        </body>\n",
        "        <script>\n",
-       "            document.getElementById(\"static_df_1241514133\").style.display = \"none\";\n",
+       "            document.getElementById(\"static_df_1241514151\").style.display = \"none\";\n",
        "        </script>\n",
        "        </html>"
       ],
       "application/kotlindataframe+json": "{\"$version\":\"2.0.0\",\"metadata\":{\"columns\":[\"What is the primary goal of Kotlin Multiplatform?\",\"How does Kotlin Multiplatform facilitate code sharing between platforms?\",\"Which platforms does Kotlin Multiplatform support?\",\"What is a common use case for Kotlin Multiplatform?\",\"What is a shared code module in Kotlin Multiplatform called?\",\"How does Kotlin Multiplatform handle platform-specific implementations?\",\"What languages can be interoperable with Kotlin Multiplatform?\",\"What tooling supports Kotlin Multiplatform development?\",\"What is the benefit of using Kotlin Multiplatform for mobile development?\",\"How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?\"],\"nrow\":2,\"ncol\":10},\"kotlin_dataframe\":[{\"What is the primary goal of Kotlin Multiplatform?\":\"To share\",\"How does Kotlin Multiplatform facilitate code sharing between platforms?\":\"By sharing business logic and adapting UI\",\"Which platforms does Kotlin Multiplatform support?\":\"Android, iOS, and web\",\"What is a common use case for Kotlin Multiplatform?\":\"Developing a cross-platform app\",\"What is a shared code module in Kotlin Multiplatform called?\":\"Shared module\",\"How does Kotlin Multiplatform handle platform-specific implementations?\":\"actual\",\"What languages can be interoperable with Kotlin Multiplatform?\":\"Java, Swift\",\"What tooling supports Kotlin Multiplatform development?\":\"IntelliJ IDEA\",\"What is the benefit of using Kotlin Multiplatform for mobile development?\":\"and sharing\",\"How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?\":\"None\"},{\"What is the primary goal of Kotlin Multiplatform?\":\"To share code between multiple platforms\",\"How does Kotlin Multiplatform facilitate code sharing between platforms?\":\"By sharing business logic and adapting UI\",\"Which platforms does Kotlin Multiplatform support?\":\"Android, iOS, and web\",\"What is a common use case for Kotlin Multiplatform?\":\"Developing a cross-platform app\",\"What is a shared code module in Kotlin Multiplatform called?\":\"Shared module\",\"How does Kotlin Multiplatform handle platform-specific implementations?\":\"Through expect and actual declarations\",\"What languages can be interoperable with Kotlin Multiplatform?\":\"Java, JavaScript, Swift\",\"What tooling supports Kotlin Multiplatform development?\":\"IntelliJ IDEA, Android Studio\",\"What is the benefit of using Kotlin Multiplatform for mobile development?\":\"Code reuse and sharing\",\"How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?\":\"Kotlin Multiplatform allows sharing code between different platforms using common modules.\"}]}"
      },
-     "execution_count": 91,
+     "execution_count": 101,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
-   "execution_count": 91
+   "execution_count": 101
   },
   {
    "metadata": {},
@@ -714,8 +714,8 @@
   {
    "metadata": {
     "ExecuteTime": {
-     "end_time": "2024-08-24T10:23:19.446801800Z",
-     "start_time": "2024-08-24T10:23:19.220805400Z"
+     "end_time": "2024-08-24T11:14:20.162191700Z",
+     "start_time": "2024-08-24T11:14:19.946198800Z"
     }
    },
    "cell_type": "code",
@@ -731,18 +731,18 @@
        "correct: Int"
       ]
      },
-     "execution_count": 92,
+     "execution_count": 102,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
-   "execution_count": 92
+   "execution_count": 102
   },
   {
    "metadata": {
     "ExecuteTime": {
-     "end_time": "2024-08-24T10:23:20.040806Z",
-     "start_time": "2024-08-24T10:23:19.652806400Z"
+     "end_time": "2024-08-24T11:14:20.619193Z",
+     "start_time": "2024-08-24T11:14:20.287192300Z"
     }
    },
    "cell_type": "code",
@@ -754,7 +754,7 @@
     {
      "data": {
       "text/html": [
-       "            <iframe onload=\"o_resize_iframe_out_77()\" style=\"width:100%;\" class=\"result_container\" id=\"iframe_out_77\" frameBorder=\"0\" srcdoc=\"        &lt;html theme='dark'&gt;\n",
+       "            <iframe onload=\"o_resize_iframe_out_86()\" style=\"width:100%;\" class=\"result_container\" id=\"iframe_out_86\" frameBorder=\"0\" srcdoc=\"        &lt;html theme='dark'&gt;\n",
        "        &lt;head&gt;\n",
        "            &lt;style type=&quot;text&sol;css&quot;&gt;\n",
        "                :root {\n",
@@ -932,7 +932,7 @@
        "            &lt;&sol;style&gt;\n",
        "        &lt;&sol;head&gt;\n",
        "        &lt;body&gt;\n",
-       "            &lt;table class=&quot;dataframe&quot; id=&quot;df_1241514136&quot;&gt;&lt;&sol;table&gt;\n",
+       "            &lt;table class=&quot;dataframe&quot; id=&quot;df_1241514154&quot;&gt;&lt;&sol;table&gt;\n",
        "\n",
        "&lt;p class=&quot;dataframe_description&quot;&gt;DataFrame: rowsCount = 10, columnsCount = 3&lt;&sol;p&gt;\n",
        "\n",
@@ -1216,21 +1216,21 @@
        "call_DataFrame(function() { DataFrame.addTable({ cols: [{ name: &quot;&lt;span title=&bsol;&quot;question: String&bsol;&quot;&gt;question&lt;&sol;span&gt;&quot;, children: [], rightAlign: false, values: [&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;What is the primary goal of Kotlin Multiplatform?&bsol;&quot;&gt;What is the primary goal of Kotlin Mu&lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;How does Kotlin Multiplatform facilitate code sharing between platforms?&bsol;&quot;&gt;How does Kotlin Multiplatform facilit&lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;Which platforms does Kotlin Multiplatform support?&bsol;&quot;&gt;Which platforms does Kotlin Multiplat&lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;What is a common use case for Kotlin Multiplatform?&bsol;&quot;&gt;What is a common use case for Kotlin &lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;What is a shared code module in Kotlin Multiplatform called?&bsol;&quot;&gt;What is a shared code module in Kotli&lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;How does Kotlin Multiplatform handle platform-specific implementations?&bsol;&quot;&gt;How does Kotlin Multiplatform handle &lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;What languages can be interoperable with Kotlin Multiplatform?&bsol;&quot;&gt;What languages can be interoperable w&lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;What tooling supports Kotlin Multiplatform development?&bsol;&quot;&gt;What tooling supports Kotlin Multipla&lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;What is the benefit of using Kotlin Multiplatform for mobile development?&bsol;&quot;&gt;What is the benefit of using Kotlin M&lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;How does Kotlin Multiplatform differ from Kotlin Native and Kotlin&sol;JS?&bsol;&quot;&gt;How does Kotlin Multiplatform differ &lt;span class=&bsol;&quot;structural&bsol;&quot;&gt;...&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;] }, \n",
        "{ name: &quot;&lt;span title=&bsol;&quot;correct: Int&bsol;&quot;&gt;correct&lt;&sol;span&gt;&quot;, children: [], rightAlign: true, values: [&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;1&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;2&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;2&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;2&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;2&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;1&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;1&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;1&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;1&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;,&quot;&lt;span class=&bsol;&quot;formatted&bsol;&quot; title=&bsol;&quot;&bsol;&quot;&gt;&lt;span class=&bsol;&quot;numbers&bsol;&quot;&gt;1&lt;&sol;span&gt;&lt;&sol;span&gt;&quot;] }, \n",
        "{ name: &quot;&lt;span title=&bsol;&quot;tq: String&bsol;&quot;&gt;tq&lt;&sol;span&gt;&quot;, children: [], rightAlign: false, values: [&quot;Wha&amp;#8230; of Kotlin Multiplatform?&quot;,&quot;How&amp;#8230;haring between platforms?&quot;,&quot;Whi&amp;#8230;in Multiplatform support?&quot;,&quot;Wha&amp;#8230;for Kotlin Multiplatform?&quot;,&quot;Wha&amp;#8230;lin Multiplatform called?&quot;,&quot;How&amp;#8230;specific implementations?&quot;,&quot;Wha&amp;#8230;ith Kotlin Multiplatform?&quot;,&quot;Wha&amp;#8230;ultiplatform development?&quot;,&quot;Wha&amp;#8230;m for mobile development?&quot;,&quot;How&amp;#8230;lin Native and Kotlin&sol;JS?&quot;] }, \n",
-       "], id: 1241514136, rootId: 1241514136, totalRows: 10 } ) });\n",
+       "], id: 1241514154, rootId: 1241514154, totalRows: 10 } ) });\n",
        "&sol;*--&gt;*&sol;\n",
        "\n",
-       "call_DataFrame(function() { DataFrame.renderTable(1241514136) });\n",
+       "call_DataFrame(function() { DataFrame.renderTable(1241514154) });\n",
        "\n",
        "\n",
        "        &lt;&sol;script&gt;\n",
        "        &lt;&sol;html&gt;\"></iframe>\n",
        "            <script>\n",
-       "                function o_resize_iframe_out_77() {\n",
-       "                    let elem = document.getElementById(\"iframe_out_77\");\n",
-       "                    resize_iframe_out_77(elem);\n",
-       "                    setInterval(resize_iframe_out_77, 5000, elem);\n",
+       "                function o_resize_iframe_out_86() {\n",
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+     "end_time": "2024-08-24T11:14:20.800192Z",
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        "   text-rendering: optimizeLegibility;\n",
        "}\n",
-       "#pItfuvL .plot-title {\n",
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-       "#pItfuvL .plot-subtitle {\n",
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-       "#dZ8orkF .axis-tooltip-text-x {\n",
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-       "#dZ8orkF .tooltip-text {\n",
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-       "#dZ8orkF .tooltip-title {\n",
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-       "#dZ8orkF .tooltip-label {\n",
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-       "                    let elem = document.getElementById(\"iframe_out_79\");\n",
-       "                    resize_iframe_out_79(elem);\n",
-       "                    setInterval(resize_iframe_out_79, 5000, elem);\n",
+       "                function o_resize_iframe_out_88() {\n",
+       "                    let elem = document.getElementById(\"iframe_out_88\");\n",
+       "                    resize_iframe_out_88(elem);\n",
+       "                    setInterval(resize_iframe_out_88, 5000, elem);\n",
        "                }\n",
-       "                function resize_iframe_out_79(el) {\n",
+       "                function resize_iframe_out_88(el) {\n",
        "                    let h = el.contentWindow.document.body.scrollHeight;\n",
        "                    el.height = h === 0 ? 0 : h + 41;\n",
        "                }\n",
@@ -2550,21 +2550,21 @@
        "            </style>\n",
        "        </head>\n",
        "        <body>\n",
-       "            <table class=\"dataframe\" id=\"static_df_1241514141\"><thead><tr><th class=\"bottomBorder\" style=\"text-align:left\">What is the primary goal of Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform facilitate code sharing between platforms?</th><th class=\"bottomBorder\" style=\"text-align:left\">Which platforms does Kotlin Multiplatform support?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is a common use case for Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is a shared code module in Kotlin Multiplatform called?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform handle platform-specific implementations?</th><th class=\"bottomBorder\" style=\"text-align:left\">What languages can be interoperable with Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">What tooling supports Kotlin Multiplatform development?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is the benefit of using Kotlin Multiplatform for mobile development?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?</th></tr></thead><tbody><tr><td  style=\"vertical-align:top\">[To share, To share code between mult<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[By sharing business logic and adapti<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[Android, iOS, and web, Android, iOS,<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[Developing a cross-platform app, Dev<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[Shared module, Shared module]</td><td  style=\"vertical-align:top\">[actual, Through expect and actual de<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[Java, Swift, Java, JavaScript, Swift]</td><td  style=\"vertical-align:top\">[IntelliJ IDEA, IntelliJ IDEA, Androi<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[and sharing, Code reuse and sharing]</td><td  style=\"vertical-align:top\">[None, Kotlin Multiplatform allows sh<span class=\"structural\">...</span></td></tr></tbody></table>\n",
+       "            <table class=\"dataframe\" id=\"static_df_1241514159\"><thead><tr><th class=\"bottomBorder\" style=\"text-align:left\">What is the primary goal of Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform facilitate code sharing between platforms?</th><th class=\"bottomBorder\" style=\"text-align:left\">Which platforms does Kotlin Multiplatform support?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is a common use case for Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is a shared code module in Kotlin Multiplatform called?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform handle platform-specific implementations?</th><th class=\"bottomBorder\" style=\"text-align:left\">What languages can be interoperable with Kotlin Multiplatform?</th><th class=\"bottomBorder\" style=\"text-align:left\">What tooling supports Kotlin Multiplatform development?</th><th class=\"bottomBorder\" style=\"text-align:left\">What is the benefit of using Kotlin Multiplatform for mobile development?</th><th class=\"bottomBorder\" style=\"text-align:left\">How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?</th></tr></thead><tbody><tr><td  style=\"vertical-align:top\">[To share, To share code between mult<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[By sharing business logic and adapti<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[Android, iOS, and web, Android, iOS,<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[Developing a cross-platform app, Dev<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[Shared module, Shared module]</td><td  style=\"vertical-align:top\">[actual, Through expect and actual de<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[Java, Swift, Java, JavaScript, Swift]</td><td  style=\"vertical-align:top\">[IntelliJ IDEA, IntelliJ IDEA, Androi<span class=\"structural\">...</span></td><td  style=\"vertical-align:top\">[and sharing, Code reuse and sharing]</td><td  style=\"vertical-align:top\">[None, Kotlin Multiplatform allows sh<span class=\"structural\">...</span></td></tr></tbody></table>\n",
        "        </body>\n",
        "        <script>\n",
-       "            document.getElementById(\"static_df_1241514141\").style.display = \"none\";\n",
+       "            document.getElementById(\"static_df_1241514159\").style.display = \"none\";\n",
        "        </script>\n",
        "        </html>"
       ],
       "application/kotlindataframe+json": "{\"$version\":\"2.0.0\",\"metadata\":{\"columns\":[\"What is the primary goal of Kotlin Multiplatform?\",\"How does Kotlin Multiplatform facilitate code sharing between platforms?\",\"Which platforms does Kotlin Multiplatform support?\",\"What is a common use case for Kotlin Multiplatform?\",\"What is a shared code module in Kotlin Multiplatform called?\",\"How does Kotlin Multiplatform handle platform-specific implementations?\",\"What languages can be interoperable with Kotlin Multiplatform?\",\"What tooling supports Kotlin Multiplatform development?\",\"What is the benefit of using Kotlin Multiplatform for mobile development?\",\"How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?\"],\"nrow\":1,\"ncol\":10},\"kotlin_dataframe\":[{\"What is the primary goal of Kotlin Multiplatform?\":[\"To share\",\"To share code between multiple platforms\"],\"How does Kotlin Multiplatform facilitate code sharing between platforms?\":[\"By sharing business logic and adapting UI\",\"By sharing business logic and adapting UI\"],\"Which platforms does Kotlin Multiplatform support?\":[\"Android, iOS, and web\",\"Android, iOS, and web\"],\"What is a common use case for Kotlin Multiplatform?\":[\"Developing a cross-platform app\",\"Developing a cross-platform app\"],\"What is a shared code module in Kotlin Multiplatform called?\":[\"Shared module\",\"Shared module\"],\"How does Kotlin Multiplatform handle platform-specific implementations?\":[\"actual\",\"Through expect and actual declarations\"],\"What languages can be interoperable with Kotlin Multiplatform?\":[\"Java, Swift\",\"Java, JavaScript, Swift\"],\"What tooling supports Kotlin Multiplatform development?\":[\"IntelliJ IDEA\",\"IntelliJ IDEA, Android Studio\"],\"What is the benefit of using Kotlin Multiplatform for mobile development?\":[\"and sharing\",\"Code reuse and sharing\"],\"How does Kotlin Multiplatform differ from Kotlin Native and Kotlin/JS?\":[\"None\",\"Kotlin Multiplatform allows sharing code between different platforms using common modules.\"]}]}"
      },
-     "execution_count": 95,
+     "execution_count": 105,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
-   "execution_count": 95
+   "execution_count": 105
   }
  ],
  "metadata": {
diff --git a/material/rest-api-ui-ktor-quiz-collector/src/main/kotlin/example/com/QuizCollector.kt b/material/rest-api-ui-ktor-quiz-collector/src/main/kotlin/example/com/QuizCollector.kt
index bbc21ea9..ab7d9d4e 100644
--- a/material/rest-api-ui-ktor-quiz-collector/src/main/kotlin/example/com/QuizCollector.kt
+++ b/material/rest-api-ui-ktor-quiz-collector/src/main/kotlin/example/com/QuizCollector.kt
@@ -1,5 +1,6 @@
 package example.com
 
+import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.html.*
 import io.ktor.server.request.*
@@ -7,8 +8,20 @@ import io.ktor.server.response.*
 import io.ktor.server.routing.*
 import kotlinx.html.*
 import kotlinx.serialization.Serializable
+import org.jetbrains.kotlinx.dataframe.api.dataFrameOf
+import org.jetbrains.kotlinx.kandy.dsl.plot
+import org.jetbrains.kotlinx.kandy.letsplot.export.toHTML
+import org.jetbrains.kotlinx.kandy.letsplot.export.toSVG
+import org.jetbrains.kotlinx.kandy.letsplot.layers.bars
+
+@Serializable
+data class QuestionStats(val question: String, val correct: Int)
 
 fun Application.configureQuizCollector() {
+    fun getCorrectStats() = quizResponses.flatMap { it.responses }.groupBy { it.question }
+        .mapValues { it.value.count { qr -> correctResponses[qr.question] == qr.answer } }
+        .map { QuestionStats(it.key, it.value) }
+
     routing {
         post("/respond") {
             val quizResponse = call.receive<QuizResponse>()
@@ -26,13 +39,7 @@ fun Application.configureQuizCollector() {
         }
 
         get("/correct-stats") {
-            @Serializable
-            data class QuestionStats(val question: String, val correct: Int)
-
-            val result = quizResponses.flatMap { it.responses }.groupBy { it.question }
-                .mapValues { it.value.count { qr -> correctResponses[qr.question] == qr.answer } }
-                .map { QuestionStats(it.key, it.value) }
-            call.respond(result)
+            call.respond(getCorrectStats())
         }
 
         get("/table2") {
@@ -52,20 +59,32 @@ fun Application.configureQuizCollector() {
                 }
                 body {
                     h1 { +"Quiz Collector" }
-                    if (quizResponses.isEmpty()) {
-                        +"No responses yet."
-                    } else {
-                        +"Responses:"
-                        ul {
-                            quizResponses.forEach { quizResponse ->
-                                li {
-                                    +"Score: ${quizResponse.getScore()}"
-                                }
+                    div {
+                        val correctStats = getCorrectStats()
+                        val statsDataFrame = dataFrameOf("question" to correctStats.map { it.question },
+                            "correct" to correctStats.map { it.correct })
+                        val content = statsDataFrame.plot {
+                            bars {
+                                y("question")
+                                x("correct")
                             }
-                        }
+                        }.toSVG()
+                        unsafe { +content }
                     }
                 }
             }
         }
+        get("/ui/correct") {
+            val correctStats = getCorrectStats()
+            val statsDataFrame = dataFrameOf("question" to correctStats.map { it.question },
+                "correct" to correctStats.map { it.correct })
+            val html = statsDataFrame.plot {
+                bars {
+                    y("question")
+                    x("correct")
+                }
+            }.toHTML(false)
+            call.respondText(html, ContentType.Text.Html)
+        }
     }
 }
\ No newline at end of file