Remove unused private method Suggest.searchBigramSuggestion

        return true;

    }

    // TODO: Use codepoint instead of char

    private int searchBigramSuggestion(final char[] word, final int offset, final int length) {

        // TODO This is almost O(n^2). Might need fix.

        // search whether the word appeared in bigram data

        int bigramSuggestSize = mBigramSuggestions.size();

        for (int i = 0; i < bigramSuggestSize; i++) {

            if (mBigramSuggestions.get(i).codePointCount() == length) {

                boolean chk = true;

                for (int j = 0; j < length; j++) {

                    if (mBigramSuggestions.get(i).codePointAt(j) != word[offset+j]) {

                        chk = false;

                        break;

                    }

                }

                if (chk) return i;

            }

        }

        return -1;

    }

    public void close() {

        final HashSet<Dictionary> dictionaries = new HashSet<Dictionary>();

        dictionaries.addAll(mUnigramDictionaries.values());