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  4. Most query operators is that they execute not when constructed, but when enumerated
using System;
using System.Collections.Generic;
using System.Linq;
public class MainClass {
    public static void Main() {
        var numbers = new List();
        numbers.Add(1);
        IEnumerable query = numbers.Select(n => n * 10);
        numbers.Add(2);             
        foreach (int n in query)
            Console.Write(n + "|"); 
    }
}