// ContainQ.kt（含みますか？）
fun main() {
    // Set
    val containQ1 = setOf("monkey", "cat", "dog", "fox")
    val answer1: Boolean = containQ1.contains("monkey")
    println("monkey: ${answer1}")
    val answer2: Boolean = containQ1.contains("eagle")
    println("eagle: ${answer2}")

    println()

    // MutableSet
    val containQ2 = mutableSetOf("koala", "beaver", "cow", "dolphin")
    val answer3: Boolean = containQ2.contains("dolphin")
    println("dolphin: ${answer3}")
    val answer4: Boolean = containQ2.contains("python")
    println("python: ${answer4}")
}
/*
monkey: true
eagle: false

dolphin: true
python: false
*/