// e.g. "if a snippet contains token X, it also contains token Y";
static L<ParsedWithTokens<PairS>> ai_findNounPlusVar(S s) {
  Set<S> vars = ai_mostLikelyVariables(s);

  replace P with ParsedWithTokens.
  new L<P<PairS>> out;

  L<P<S>> nouns = pwt_filter isNoun(pwt_initial(s, 2));
  print(+nouns);
  for (P<S> noun : nouns)
    for (P<S> var : pwt_stepRight_filter(1, x -> contains(vars, x), noun))
      out.add(pwt_combine(pair(noun!, var!), noun, var));
  
  ret out;
}