let first: Set = [1, 2]
let second: Set = [1, 2]
let third: Set = [1, 2, 3]

let isEqual = first == second
//isEqual is true

let isIntersects = !first.isDisjoint(with: third)
//isIntersects is true

let isSubset = third.isSubset(of: first)
//isSubset is false

print("isEqual is \(isEqual)")
print("isIntersects is \(isIntersects)")
print("isSubset is \(isSubset)")