toMutableList

fun <T> Sequence<T>.toMutableList(): MutableList<T>(source)

fun main() {
    val sequence = sequenceOf(10, 20, 30, 40, 50)
    val mutableList = sequence.toMutableList()   // converts the sequence to a MutableList
    mutableList.add(60)                         // modify the list
    println(mutableList)                        // prints: [10, 20, 30, 40, 50, 60]
}