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  4. A query to extract strings containing the letter a, sorted by length and converted to uppercase
using System;
using System.Collections.Generic;
using System.Linq;
class LinqDemo {
    static void Main() {
        string[] names = { "J", "P", "G", "Pa" };
        IEnumerable query =
          from n in names
          where n.Contains("a")     
          orderby n.Length          
          select n.ToUpper();       
        foreach (string name in query) Console.Write(name + "/");
    }
}