/**
 * Given two sets, check if they are difference sets.
 * If they are difference sets, return true, otherwise return false.
 */
fun checkIfDifferenceSet(set1: Set<Int>, set2: Set<Int>): Boolean {

    return set1.minus(set2) == set1
}
/**
 * Given two sets, check if they are difference sets.
 * If they are difference sets, return true, otherwise return false.
 */
fun checkIfDifferenceSet(set1: Set<Int>, set2: Set<Int>): Boolean {
/**
 * Given two sets, check if they are difference sets.
 * If they are difference sets, return true, otherwise return false.
 */
fun checkIfDifferenceSet(set1: Set<Int>, set2: Set<Int>): Boolean {

    return set1.minus(set2) == set1
}