diff --git a/spylls/hunspell/algo/permutations.py b/spylls/hunspell/algo/permutations.py
index d6e1089..330da67 100644
--- a/spylls/hunspell/algo/permutations.py
+++ b/spylls/hunspell/algo/permutations.py
@@ -66,7 +66,7 @@ def mapchars_internal(word, start=0):
                 pos = word.find(option, start)
                 if pos != -1:
                     for other in options:
-                        if other == option:
+                        if other == option or word[pos-len(other)+1:].startswith(other):
                             continue
                         replaced = word[:pos] + other + word[pos+len(option):]
                         yield replaced