Index: gc_core/js/char_player.js
==================================================================
--- gc_core/js/char_player.js
+++ gc_core/js/char_player.js
@@ -17,20 +17,26 @@
     ]),
 
     cleanWord: function (sWord) {
         // word simplication before calculating distance between words
         sWord = sWord.toLowerCase();
-        let sRes = "";
+        let sNewWord = "";
+        let i = 1;
         for (let c of sWord) {
-            sRes += this._dTransChars.gl_get(c, c);
+            let cNew = this._dTransChars.gl_get(c, c);
+            let cNext = sWord.slice(i, i+1)
+            if (cNew != this._dTransChars.gl_get(cNext, cNext)) {
+                sNewWord += cNew;
+            }
+            i++;
         }
-        return sRes.replace("eau", "o").replace("au", "o");
+        return sNewWord.replace("eau", "o").replace("au", "o").replace("ai", "e").replace("ei", "e");
     },
 
     aVowel: new Set("aáàâäāeéèêëēiíìîïīoóòôöōuúùûüūyýỳŷÿȳœæAÁÀÂÄĀEÉÈÊËĒIÍÌÎÏĪOÓÒÔÖŌUÚÙÛÜŪYÝỲŶŸȲŒÆ"),
     aConsonant: new Set("bcçdfghjklmnñpqrstvwxzBCÇDFGHJKLMNÑPQRSTVWXZ"),
-    aDouble: new Set("bcçdfjklmnprstzBCÇDFJKLMNPRSTZ"),  // letters that may be used twice successively
+    aDouble: new Set("bcdfjklmnprstzBCDFJKLMNPRSTZ"),  // letters that may be used twice successively
 
 
     // Similar chars
 
     d1to1: new Map([

Index: gc_core/py/char_player.py
==================================================================
--- gc_core/py/char_player.py
+++ gc_core/py/char_player.py
@@ -14,16 +14,21 @@
     'œ': 'oe',  'æ': 'ae', 
 })
 
 def cleanWord (sWord):
     "word simplication before calculating distance between words"
-    return sWord.lower().translate(_xTransChars).replace("eau", "o").replace("au", "o")
+    sWord = sWord.lower().translate(_xTransChars)
+    sNewWord = ""
+    for i, c in enumerate(sWord, 1):
+        if c != sWord[i:i+1]:
+            sNewWord += c
+    return sNewWord.replace("eau", "o").replace("au", "o").replace("ai", "e").replace("ei", "e")
 
 
 aVowel = set("aáàâäāeéèêëēiíìîïīoóòôöōuúùûüūyýỳŷÿȳœæAÁÀÂÄĀEÉÈÊËĒIÍÌÎÏĪOÓÒÔÖŌUÚÙÛÜŪYÝỲŶŸȲŒÆ")
 aConsonant = set("bcçdfghjklmnñpqrstvwxzBCÇDFGHJKLMNÑPQRSTVWXZ")
-aDouble = set("bcçdfjklmnprstzBCÇDFJKLMNPRSTZ")  # letters that may be used twice successively
+aDouble = set("bcdfjklmnprstzBCDFJKLMNPRSTZ")  # letters that may be used twice successively
 
 
 # Similar chars
 
 d1to1 = {