6.4. Logical PairsIt is quite common to overload the equality operator (==) to test whether two objects are equal (however equality might be defined for your object). C# insists that if you overload the equals operator, you must also overload the not-equals operator (!=). Similarly, the less-than (<) and greater-than (>) operators must be paired, as must the less-than or equals (<=) and greater-than or equals (>=) operators.
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