diff --git a/micall/tests/test_find_maximum_overlap.py b/micall/tests/test_find_maximum_overlap.py
index 714c0eb70..e96ceae7e 100644
--- a/micall/tests/test_find_maximum_overlap.py
+++ b/micall/tests/test_find_maximum_overlap.py
@@ -1,5 +1,5 @@
 import pytest
-from micall.utils.find_maximum_overlap import find_maximum_overlap
+from micall.utils.find_maximum_overlap import find_maximum_overlap, show_maximum_overlap
 
 
 @pytest.mark.parametrize(
@@ -25,3 +25,57 @@ def test_maximum_overlap_cases(left, right, expected):
     else:
         with pytest.raises(expected):
             find_maximum_overlap(left, right)
+
+
+@pytest.mark.parametrize(
+    "left, right, expected",
+    [
+        ('tttttxxxxx', 'uuuuuxxx', '''\
+tttttxxxxx
+uuuuuxxx--
+'''),
+        ('tttttxxx', 'uuuuuxxxxx', '''\
+--tttttxxx
+uuuuuxxxxx
+'''),
+        ('xxxttttt', 'xxxxxuuuuu', '''\
+--xxxttttt
+xxxxxuuuuu
+'''),
+        ('xxxxxttttt', 'xxxuuuuu', '''\
+xxxxxttttt
+xxxuuuuu--
+'''),
+        ('xxxxttttt', 'uuuuuxxx', '''\
+-----xxxxttttt
+uuuuuxxx------
+'''),
+        ('aaaaxxxxttttt', 'uxxxk', '''\
+aaaaxxxxttttt
+---uxxxk-----
+'''
+         ),
+        ('tttttxxxx', 'xxxuuuuu', '''\
+tttttxxxx-----
+------xxxuuuuu
+'''),
+        ('tttttxxxx', 'xxxuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu', '''\
+tttttxxxx-------------------------------
+------xxxuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
+'''),
+        ('tttttxxxxpppppppppppppppppppp', 'xxxuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu', '''\
+tttttxxxxpppppppppppppppppppp-----------
+------xxxuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
+'''),
+    ],
+)
+def test_print(left, right, expected):
+    shift = find_maximum_overlap(left, right)
+    ret = show_maximum_overlap(left, right, shift)
+    if ret != expected:
+        print()
+        print()
+        print(ret)
+        print()
+        print()
+    assert ret == expected
diff --git a/micall/utils/find_maximum_overlap.py b/micall/utils/find_maximum_overlap.py
index ba9574ef2..eeb271dbc 100644
--- a/micall/utils/find_maximum_overlap.py
+++ b/micall/utils/find_maximum_overlap.py
@@ -71,3 +71,17 @@ def find_maximum_overlap(arr1: Sequence[object],
 
     shift_value = max_offset - len(total)
     return int(shift_value)
+
+
+def show_maximum_overlap(arr1: Sequence[object],
+                         arr2: Sequence[object],
+                         shift: int,
+                         ) -> str:
+
+    arr1_line = '-' * (abs(shift) - len(arr1)) + ''.join(map(str, arr1))
+    arr2_line = '-' * (len(arr1) - abs(shift)) + ''.join(map(str, arr2))
+    max_len = max(len(arr1_line), len(arr2_line))
+    lines = (x.ljust(max_len, '-')
+             for x in [arr1_line, arr2_line])
+
+    return '\n'.join(chain(lines, ['']))