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XOR stands XOR stands for "Exclusive OR" and is used for constraints

...

1. This function is used in constraints only.

2. The XOR (Exclusive

   OR

   ) returns TRUE if the values tested are different, and returns FALSE only if they are the same.

3. Other operators

   are EQV

   are ,

    IMP

    ,

    OR and AND 

     and 

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