static T3<S> ai_parseNounVerbNoun(LS tok) {
  S a, b, c;
  ret l(tok) == 3*2+1
    && isNoun(a = uncurly(tok.get(1)))
    && isVerb(b = uncurly(tok.get(3)))
    && isNoun(c = uncurly(tok.get(5)))
    ? t3(a, b, c) : null;
}