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using System;
using System.Collections.Generic;
 
class Program
{
    static void Main(string[] args)
    {
        var list = new List<Tuple<int, string>>();
 
        list.Add(Tuple.Create(31, "Jan"));
        list.Add(Tuple.Create(28, "Feb"));
        list.Add(Tuple.Create(31, "Mar"));
        list.Add(Tuple.Create(30, "Apr"));
        list.Add(Tuple.Create(31, "Jan"));
 
        list.Sort((Tuple<int, string> t1, Tuple<int, string> t2) => (t2.Item1 - t1.Item1));
 
        foreach (var t in list)
        {
            Console.WriteLine("{0} {1}", t.Item1, t.Item2);
 
        }
    }
}
 

prog.cs(8,29): error CS0246: The type or namespace name `Tuple' could not be found. Are you missing a using directive or an assembly reference?
prog.cs(8,9): error CS0825: The contextual keyword `var' may only appear within a local variable declaration
prog.cs(10,9): error CS0841: A local variable `list' cannot be used before it is declared
prog.cs(11,9): error CS0841: A local variable `list' cannot be used before it is declared
prog.cs(12,9): error CS0841: A local variable `list' cannot be used before it is declared
prog.cs(13,9): error CS0841: A local variable `list' cannot be used before it is declared
prog.cs(14,9): error CS0841: A local variable `list' cannot be used before it is declared
prog.cs(16,9): error CS0841: A local variable `list' cannot be used before it is declared
prog.cs(18,27): error CS0841: A local variable `list' cannot be used before it is declared
Compilation failed: 9 error(s), 0 warnings

Standard output is empty