static S ai_ifAndInput(S rule, S input) {
  L<S> tok = javaTokDroppingBracketsC_unquote(rule);
  new Matches m;
  if (simpleStarMatchOnCTokensIC("if * and input * then say *", tok, m)) {
    if (!match($2, input)) null;
    T3<S> t = ai_tripelize(ai_bigXToDollarX($1));
    printStruct(+t);
    S x = random(ai_texts(t));
    if (x == null) null;
    ret ai_replaceBigX($3, x);
  }
  null;
}