user
08/21/2017, 1:42 PMval Collection<String>.palindromes: List<String>
    get() = map { it.split(" ") } .filter { it.isPalindrome()) }
var MutableCollection<String>.palindromes: List<String>
    @JvmName("prop2")
    get() = map { it.split(" ") } .filter { it.isPalindrome()) }
    set(list: List<String>) = addAll(list.palindromes)