Do not add profanity to user history bigram dicitonary

            } else {

                secondWord = suggestion.toString();

            }

            // We demote unrecognized word and words with 0-frequency (assuming they would be

            // profanity etc.) by specifying them as "invalid".

            // We demote unrecognized words (frequency < 0, below) by specifying them as "invalid".

            // We don't add words with 0-frequency (assuming they would be profanity etc.).

            final int maxFreq = AutoCorrection.getMaxFrequency(

                    mSuggest.getUnigramDictionaries(), suggestion);

            if (maxFreq == 0) return null;

            mUserHistoryDictionary.addToUserHistory(null == prevWord ? null : prevWord.toString(),

                    secondWord, maxFreq > 0);

            return prevWord;