}
}

func TestSub() {
	mc := _Copy(m1)
	_Sub(mc, mc)
	if len(mc) > 0 {
		panic(fmt.Sprintf("_Sub(%v, %v) = %v, want empty map", m1, m1, mc))
	}
	mc = _Copy(m1)
	_Sub(mc, map[int]int{1: 0})
	want := map[int]int{2: 4, 4: 8, 8: 16}
	if !_Equal(mc, want) {
		panic(fmt.Sprintf("_Sub result = %v, want %v", mc, want))
	}
}

func TestIntersect() {
	mc := _Copy(m1)

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