private static boolean isKanaBreak(int cur, int prev) {
    if (!maybeKana(cur) && !maybeKana(prev)) return false;
    Character.UnicodeScript curScript = Character.UnicodeScript.of(cur);
    Character.UnicodeScript prevScript = Character.UnicodeScript.of(prev);
    if (prevScript == curScript) return false;
    return (curScript == Character.UnicodeScript.KATAKANA || curScript == Character.UnicodeScript.HIRAGANA ||
            prevScript == Character.UnicodeScript.KATAKANA || prevScript == Character.UnicodeScript.HIRAGANA) &&
           prevScript != Character.UnicodeScript.COMMON && curScript != Character.UnicodeScript.COMMON;
  }
private static boolean isKanaBreak(int cur, int prev)