A := make(map[int]struct{})
	B := map[int]struct{}{1: {}, 2: {}}
	gset.Add(A, B)
	fmt.Println(A) // Output: map[1:{} 2:{}]

	// Initialize HashSets
	set1 := gset.HashSet[string]{"apple": {}, "banana": {}}
	set2 := gset.HashSet[string]{"pear": {}, "orange": {}}
	set3 := gset.HashSet[string]{"banana": {}, "durian": {}}

	// calculate the union of them
	result := set1.
		Add(set2).
		Add(set3)

	// Print the contents of the updated set
	for _, k := range gset.Sorted(result) {
		fmt.Println(k)
	}

	// Output:
	// apple
	// banana
	// durian
	// orange
	// pear