containsAll

import kotlin.math.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val collection = mutableListOf('a', 'b')
val test = listOf('a', 'b', 'c')
println("collection.containsAll(test) is ${collection.containsAll(test)}") // false

collection.add('c')
println("collection.containsAll(test) is ${collection.containsAll(test)}") // true 
   //sampleEnd
}