diff --git a/dlibrary/dlibrary.py b/dlibrary/dlibrary.py
index 03f7f4e..97d657c 100755
--- a/dlibrary/dlibrary.py
+++ b/dlibrary/dlibrary.py
@@ -837,13 +837,13 @@ def similarity(a, b):
     if (shorter, longer) in memoized_similarities:
         return memoized_similarities[(shorter, longer)]
 
-    skip_similarity = similarity(shorter[1:], longer)
-    match_idx = longer.find(shorter[0])
-    if match_idx == -1:
-        result = skip_similarity
-    else:
-        take_similarity = 1 + similarity(shorter[1:], longer[match_idx+1:])
-        result = max(skip_similarity, take_similarity)
+    options = [similarity(shorter[1:], longer)]
+    for i in range(1, len(shorter)+1):
+        match_idx = longer.find(shorter[:i])
+        if match_idx == -1:
+            break
+        options.append(i*i + similarity(shorter[i:], longer[match_idx+i:]))
+    result = max(options)
 
     memoized_similarities[(shorter, longer)] = result
     return result