for(final Map.Entry<Character, List<LetterMatcherEntry>> entry : letterAndRulesNotCombinable.entrySet()){
                letterAndRulesNotCombinableKeys[offset ++] = entry.getKey();
                this.letterAndRulesNotCombinable.put(entry.getKey(), entry.getValue().toArray(new LetterMatcherEntry[0]));
            }