static LS fullPhraseCache_group(FullPhraseCache cache, LS tok) {
  if (cache == null) ret tok;
  tok = cloneList(tok);
  for (int i = 1; i < l(tok); i += 2) {
    int j = fullPhraseCache_longestPhraseLength(cache, tok, i);
    if (j > i) {
      j -= 2;
      tok_addCurlyBracketsAroundPart(tok, i, j);
      i = j;
    }
  }
  ret tok;
}

sS fullPhraseCache_group(FullPhraseCache cache, S s) {
  ret join(fullPhraseCache_group(cache, javaTokNPunctuation(s)));
}