import io:*
import set:*

fun main():int {
    var s = set(3)
    println(s.contains(3))
    println(s.contains(1))
    s.remove(3)
    s.add(4)
    println(s.contains(3))
    println(s.contains(4))

    println(s == set(4))
    println(s == set(5))
    s.add(set(5))
    println(s == set(4))
    println(s == set(5))
    println(s.contains(3))
    println(s.contains(4))
    println(s.contains(5))

    s.for_each( fun(it: int) println(it); )
    return 0
}