}
	s2.Insert("a", "b", "d")
	if s.IsSuperset(s2) {
		t.Errorf("Unexpected contents: %#v", s)
	}
	s2.Delete("d")
	if !s.IsSuperset(s2) {
		t.Errorf("Missing contents: %#v", s)
	}
}

func TestSetDeleteMultiples(t *testing.T) {
	s := sets.Set[string]{}
	s.Insert("a", "b", "c")
	if len(s) != 3 {
		t.Errorf("Expected len=3: %d", len(s))
	}

	s.Delete("a", "c")
	if len(s) != 1 {