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