static int ai_countIdenticalWords(S a, S b) {
  LS tokA = javaTokWithBrackets_cached(a);
  LS tokB = javaTokWithBrackets_cached(b);
  if (l(tokA) != l(tokB)) ret 0;
  int score = 0;
  for (int i = 1; i < l(tokA); i += 2)
    if (eqic(tokA.get(i), tokB.get(i))) ++score;
  ret score;
}