diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 35a1646e..8546d888 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -5,12 +5,9 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="48b609c4-0198-44a9-8f40-0a1e1f4ae31e" name="Changes" comment="interpretation">
-      <change afterPath="$PROJECT_DIR$/src/punctilious/data/mappings/propositional_variables_1_mappings.yaml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/punctilious/data/representations/latin_alphabet_uppercase_serif_italic.yaml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/punctilious/data/variables/__init__.py" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/punctilious/data/variables/propositional_logic_1_variables.yaml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/punctilious/data/mappings/operators_1_mappings.yaml" beforeDir="false" afterPath="$PROJECT_DIR$/src/punctilious/data/mappings/operators_1_mappings.yaml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/punctilious/data/representations/latin_alphabet_uppercase_serif_italic.yaml" beforeDir="false" afterPath="$PROJECT_DIR$/src/punctilious/data/representations/latin_alphabet_uppercase_serif_italic.yaml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/punctilious/interpretation.py" beforeDir="false" afterPath="$PROJECT_DIR$/src/punctilious/interpretation.py" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -800,14 +797,6 @@
       <option name="presentableId" value="Default" />
       <updated>1687980987309</updated>
     </task>
-    <task id="LOCAL-01118" summary="Lark + yaml">
-      <option name="closed" value="true" />
-      <created>1731820332075</created>
-      <option name="number" value="01118" />
-      <option name="presentableId" value="LOCAL-01118" />
-      <option name="project" value="LOCAL" />
-      <updated>1731820332075</updated>
-    </task>
     <task id="LOCAL-01119" summary="Lark + yaml">
       <option name="closed" value="true" />
       <created>1731850074354</created>
@@ -1192,7 +1181,15 @@
       <option name="project" value="LOCAL" />
       <updated>1733571619564</updated>
     </task>
-    <option name="localTasksCounter" value="1167" />
+    <task id="LOCAL-01167" summary="interpretation">
+      <option name="closed" value="true" />
+      <created>1733573989450</created>
+      <option name="number" value="01167" />
+      <option name="presentableId" value="LOCAL-01167" />
+      <option name="project" value="LOCAL" />
+      <updated>1733573989450</updated>
+    </task>
+    <option name="localTasksCounter" value="1168" />
     <servers>
       <YouTrack url="https://punctilious.youtrack.cloud">
         <username>random</username>
diff --git a/src/punctilious/data/representations/latin_alphabet_uppercase_serif_italic.yaml b/src/punctilious/data/representations/latin_alphabet_uppercase_serif_italic.yaml
index f6f0ea06..84814065 100644
--- a/src/punctilious/data/representations/latin_alphabet_uppercase_serif_italic.yaml
+++ b/src/punctilious/data/representations/latin_alphabet_uppercase_serif_italic.yaml
@@ -1,190 +1,164 @@
 schema: http://punctilious.org/data/schemas/punctilious_package_schema_1.yaml
-uuid: 9e7bb302-ab55-43f8-b023-1e1cd8d6493b
+uuid: b65f7b26-0b0a-46f8-92ff-5a6b69f14791
 slug: latin_alphabet_uppercase_serif_italic
 # source:
 # https://en.wikipedia.org/wiki/Mathematical_Alphanumeric_Symbols
 representations:
   - slug: a
     uuid: 392475c8-1cf2-4f4e-a095-67fea3deb2c4
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: A }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑎 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐴 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{A}' }
   - slug: b
     uuid: 61223dfd-9180-406f-ba8e-c51d57304748
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: B }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑏 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐵 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{B}' }
   - slug: c
     uuid: b51812af-1a41-4ba1-88a2-65b1a4b6350f
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: C }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑐 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐶 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{C}' }
   - slug: d
     uuid: 1b76060a-1adc-447a-8128-071d84c18a30
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: D }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑑 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐷 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{D}' }
   - slug: e
     uuid: a31b6fef-7c58-4e88-a000-df7f77ab63cc
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: E }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑒 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐸 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{E}' }
   - slug: f
     uuid: de3c5c9a-91f7-4235-bc90-552767114ade
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: F }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑓 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐹 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{F}' }
   - slug: g
     uuid: 5995ebc7-71ad-422a-8b4a-530b658ca420
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: G }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑔 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐺 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{G}' }
   - slug: h
     uuid: 3d82d947-2a02-48fc-99f9-17611cd430b8
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: H }
-      - { encoding: unicode_extended, mode: symbolic, template: ℎ }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐻 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{H}' }
   - slug: i
     uuid: 1cb67968-93f3-4ba2-8d5e-09c5de337d79
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: I }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑖 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐼 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{I}' }
   - slug: j
     uuid: 97480bbc-2b9a-4b02-8e25-32dd62b3e85a
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: J }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑗 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐽 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{J}' }
   - slug: k
     uuid: e4144251-03e1-44ff-9dc2-460aa95f918a
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: K }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑘 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐾 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{K}' }
   - slug: l
     uuid: 14021f1d-18b1-4c70-9506-6a4fb0ba88db
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: L }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑙 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝐿 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{L}' }
   - slug: m
     uuid: eb0d8b56-e2ff-40b1-9a84-41e8c5612f0c
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: M }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑚 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑀 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{M}' }
   - slug: n
     uuid: 0d042170-48b7-40b4-b83e-3bb606aeb397
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: N }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑛 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑁 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{N}' }
   - slug: o
     uuid: c173dc29-90b6-4293-9ddc-462938a23caf
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: O }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑜 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑂 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{O}' }
   - slug: p
     uuid: 597b00c2-2b49-4728-aff1-05f6a0cc6670
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: P }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑝 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑃 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{P}' }
   - slug: q
     uuid: f9bf9991-d2f4-46cc-be0e-157d5bb03a48
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: Q }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑞 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑄 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{Q}' }
   - slug: r
     uuid: 0d005ce6-2726-46f0-acc6-1bce5aefdd89
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: R }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑟 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑅 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{R}' }
   - slug: s
     uuid: f26b1782-59dc-4131-9174-a3c996c2a1c6
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: S }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑠 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑆 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{S}' }
   - slug: t
     uuid: 8f77ec81-9ff4-40da-9a3b-7d0d20f97554
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: T }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑡 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑇 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{T}' }
   - slug: u
     uuid: 58e98493-41dc-4f52-a01b-28f329d2313d
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: U }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑢 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑈 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{U}' }
   - slug: v
     uuid: f4349f29-bd18-4dfc-af27-8fb69e2417b5
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: V }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑣 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑉 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{V}' }
   - slug: w
     uuid: b6f0068c-e74a-4051-9ca0-cf0b66dc2fcd
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: W }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑤 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑊 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{W}' }
   - slug: x
     uuid: fbb76257-5d0f-456e-92d4-8e80772e14fb
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: X }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑥 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑋 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{X}' }
   - slug: y
     uuid: 4e870a36-7e0e-4198-becd-fbaa88aedefb
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: Y }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑦 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑌 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{Y}' }
   - slug: z
     uuid: f3fdc89f-4c15-4a1e-8a04-b0cfe4d96690
-    syntactic_rules: { fixed_arity: 0 }
     renderers:
       - { encoding: unicode_basic, mode: symbolic, template: Z }
-      - { encoding: unicode_extended, mode: symbolic, template: 𝑧 }
+      - { encoding: unicode_extended, mode: symbolic, template: 𝑍 }
       - { encoding: latex_math, mode: symbolic, template: '\textit{Z}' }
 
 
diff --git a/src/punctilious/interpretation.py b/src/punctilious/interpretation.py
index c0c62c2d..b2f67242 100644
--- a/src/punctilious/interpretation.py
+++ b/src/punctilious/interpretation.py
@@ -1,43 +1,5 @@
 import lark
 
-TECHNICAL_1_GRAMMAR = """
-    ?start: expr
-
-    WORD: /[a-z]/ | /[a-z][a-z0-9_]*[a-z0-9]/
-
-    ?expr: WORD "(" [expr_list] ")"       -> parse_function
-         | WORD                            -> parse_function
-    expr_list: expr ("," expr)*            -> parse_arguments
-
-    // %import common.CNAME -> WORD
-    %import common.WS
-    %ignore WS
-"""
-
-TECHNICAL_2_GRAMMAR = """
-    ?start : formula_expression
-
-    ?formula_expression : FUNCTION_CONNECTOR "(" function_formula_arguments ")" -> parse_function_formula
-         | formula_expression INFIX_CONNECTOR formula_expression -> parse_infix_formula
-         | PREFIX_CONNECTOR ATOMIC_CONNECTOR -> parse_prefix_formula
-         | ATOMIC_CONNECTOR -> parse_atomic_formula
-         | "(" FUNCTION_CONNECTOR "(" function_formula_arguments ")" ")" -> parse_function_formula
-         | "(" formula_expression INFIX_CONNECTOR formula_expression ")" -> parse_infix_formula
-         | "(" PREFIX_CONNECTOR ATOMIC_CONNECTOR ")" -> parse_prefix_formula
-         | "(" ATOMIC_CONNECTOR ")" -> parse_atomic_formula     
-         
-    function_formula_arguments . 20 : formula_expression ("," formula_expression)* -> parse_function_formula_arguments
-    parenthesized_formula_expression .10 : "(" formula_expression ")"
-    
-    FUNCTION_CONNECTOR . 4 : "not" | "non" | "¬" | "~" | "is-a-proposition" | "is-a-natural-number"
-    INFIX_CONNECTOR . 3 : "and" | "et" | "∧" | "^" | "or"
-    PREFIX_CONNECTOR . 2 : "not" | "non" | "¬" | "~"
-    ATOMIC_CONNECTOR . 1 : "P" | "Q" | "R"
-    
-    %import common.WS
-    %ignore WS
-"""
-
 
 class Formula:
     def __init__(self, connector, arguments=None):
@@ -50,7 +12,7 @@ def __str__(self):
         return f'{self.connector}({", ".join(map(str, self.arguments))})'
 
 
-class Technical1Transformer(lark.Transformer):
+class Transformer(lark.Transformer):
     """Transformed the Lark tree parsed of a Technical1 input, into a proper Formula."""
 
     def parse_function_formula(self, items) -> Formula:
@@ -85,32 +47,60 @@ def parse_atomic_formula(self, items):
         return Formula(connector=atomic_connector, arguments=arguments)
 
 
-def interpret_formula(input_string: str) -> Formula:
-    # Define the parser
-    parser = lark.Lark(TECHNICAL_2_GRAMMAR, start='start')
+class Interpreter:
+    _grammar = """
+        ?start : formula_expression
+
+        ?formula_expression : FUNCTION_CONNECTOR "(" function_formula_arguments ")" -> parse_function_formula
+             | formula_expression INFIX_CONNECTOR formula_expression -> parse_infix_formula
+             | PREFIX_CONNECTOR ATOMIC_CONNECTOR -> parse_prefix_formula
+             | ATOMIC_CONNECTOR -> parse_atomic_formula
+             | "(" FUNCTION_CONNECTOR "(" function_formula_arguments ")" ")" -> parse_function_formula
+             | "(" formula_expression INFIX_CONNECTOR formula_expression ")" -> parse_infix_formula
+             | "(" PREFIX_CONNECTOR ATOMIC_CONNECTOR ")" -> parse_prefix_formula
+             | "(" ATOMIC_CONNECTOR ")" -> parse_atomic_formula     
+
+        function_formula_arguments . 20 : formula_expression ("," formula_expression)* -> parse_function_formula_arguments
+        parenthesized_formula_expression .10 : "(" formula_expression ")"
+
+        # OPEN_PARENTHESIS : "("
+        # CLOSE_PARENTHESIS : ")"
+        # COMMA : ","
+        FUNCTION_CONNECTOR . 4 : "not" | "non" | "¬" | "~" | "is-a-proposition" | "is-a-natural-number"
+        INFIX_CONNECTOR . 3 : "and" | "et" | "∧" | "^" | "or"
+        PREFIX_CONNECTOR . 2 : "not" | "non" | "¬" | "~"
+        ATOMIC_CONNECTOR . 1 : "P" | "Q" | "R"
+
+        %import common.WS
+        %ignore WS
+    """
 
-    transformer = Technical1Transformer()
+    def __init__(self):
+        self._parser = lark.Lark(Interpreter._grammar, start='start', parser='earley', debug=True)
+        self._transformer = Transformer()
 
-    tree = parser.parse(input_string)
-    print(tree)
-    result = transformer.transform(tree)
-    print(result)
-    return result
+    def interpret(self, input_string: str) -> Formula:
+        tree = self._parser.parse(input_string)
+        print(tree)
+        result = self._transformer.transform(tree)
+        print(result)
+        return result
 
 
 # Output the parsed structure
+interpreter = Interpreter()
 input_string = "is-a-proposition(P)"
-formula = interpret_formula(input_string)
+formula = interpreter.interpret(input_string)
 input_string = "P and Q"
-formula = interpret_formula(input_string)
+formula = interpreter.interpret(input_string)
 input_string = "not P"
-formula = interpret_formula(input_string)
+formula = interpreter.interpret(input_string)
 input_string = "(P and Q)"
-formula = interpret_formula(input_string)
+formula = interpreter.interpret(input_string)
 input_string = "(P and Q) and (Q and P)"
-formula = interpret_formula(input_string)
+formula = interpreter.interpret(input_string)
 input_string = "not(not P)"
-formula = interpret_formula(input_string)
+formula = interpreter.interpret(input_string)
 input_string = "not(not (is-a-proposition(P) and Q) and (Q and P))"
-formula = interpret_formula(input_string)
+formula = interpreter.interpret(input_string)
 pass