val first = setOf(1, 2)
val second = setOf(1, 2)
val third = setOf(1, 2, 3)
val isEqual = first == second
//isEqual is true
val isIntersects = first.intersect(third).any()
//isIntersects is true
val isSubset = first.containsAll(third)
//isSubset is false
println("isEqual is $isEqual")
println("isIntersects is $isIntersects")
println("isSubset is $isSubset")