static S n3(long l, S singular) {
  ret n2(l, singular, plural_mech(singular));
}

static S n3(Collection l, S singular) {
  ret n3(l(l), singular);
}

static S n3(Map m, S singular, S plural) {
  ret n3(l(m), singular);
}

static S n3(O[] a, S singular, S plural) {
  ret n3(l(a), singular);
}

ifclass MultiSet
  static S n3(MultiSet ms, S singular, S plural) {
    ret n3(l(ms), singular);
  }
endif