using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
int[] numbers = { 1, 3, 5, 4};
var query = numbers.TakeWhile(( n, index) => n >= index);
var query2 = numbers.SkipWhile(( n, index) => n >= index);
}
}