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	using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace ConsoleApplication1
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{
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    class Program
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    {
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        static void Main(string[] args)
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        {
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        }
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    }
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}
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class polynomial
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{ public polynomial()
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  public override string ToString() 
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  {
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     string s = .ToString();
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     return ;
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  }
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        public static polynomial  operator -(polynomial  , polynomial)
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        {
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            return new polynomial( - );
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        }
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      publicreadonlyint x, y;
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      public readonly int x, y;
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    public TwoDPoint(int x, int y)  //constructor
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    {
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        this.x = x;
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        this.y = y;
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    }
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    publicoverridebool Equals(System.Object obj)
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    public override bool Equals(System.Object obj)
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    {
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      if (obj == null)
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        {
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            returnfalse;
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            return false;
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        }
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        TwoDPoint p = obj as TwoDPoint;
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        if ((System.Object)p == null)
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        {
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            returnfalse;
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            return false;
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        }
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        return (x == p.x) && (y == p.y);
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    }
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    publicbool Equals(TwoDPoint p)
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    public bool Equals(TwoDPoint p)
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    {
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        if ((object)p == null)
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        {
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            returnfalse;
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            return false;
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        }
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       return (x == p.x) && (y == p.y);
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    }
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    publicoverrideint GetHashCode()
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    public override int GetHashCode()
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    {
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        return  ;
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    }
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}
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}
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}