static void ai_spec_singularPlural(S s) {
  if (is(s, 'singular) || is(s, 'plural)) ret;
  if (!endsWithLetter(s)) ret;
  if (ewic(s, 's)) {
    post(s, "possibly is", 'plural);
    post(s, "possibly is plural of", dropLast(s));
  } else
    post(s, "possibly is", 'singular);
}