using System;

using System.Collections.Generic;

public class Program

{

    public class OverrideEqualsReturnsFalse

    {

        public override bool Equals(object obj)

        {

            return false;

        }

    }

    public class ImplementsIEquatableReturnsFalse : IEquatable<ImplementsIEquatableReturnsFalse>

    {

        public override bool Equals(object obj)

        {

            return true;

        }

        public bool Equals(ImplementsIEquatableReturnsFalse other)

        {

            return false;

        }

    }

    public static void Main()

    {

        var one1 = new OverrideEqualsReturnsFalse();

        var two1 = one1;

            Console.WriteLine(one1.Equals(two1));

            var one2 = new ImplementsIEquatableReturnsFalse();

        var two2 = one2;

        Console.WriteLine(one2.Equals(two2));

        Console.WriteLine(EqualityComparer<ImplementsIEquatableReturnsFalse>.Default.Equals(one2, two2));

    }

}