static Set<S> getPlural_specials = litciset("sheep", "fish");

static S getPlural(S s) {
  if (contains(getPlural_specials, s)) ret s;
  if (ewic(s, "y")) ret dropSuffixIgnoreCase("y", s) + "ies";
  if (ewicOneOf(s, "ss", "ch")) ret s + "es";
  if (ewic(s, "s")) ret s;
  ret s + "s";
}