Update mistakes

utils.py

@@ -18,6 +18,9 @@ mistakes = {
     'D': ['0', 'O', 'V'],
     'O': ['0', 'D', 'V'],
     'V': ['0', 'D', 'O'],
+    '4': ['A', 'X'],
+    'A': ['4', 'X'],
+    'X': ['4', 'A'],
     '5': ['S'],
     'S': ['5'],
     'F': ['H'],