Question: Eliminate redundant in the set

> A := {x=0, y=0}:

> B := {x=0, -y=0};

> {A} union {B};

{{x=0, y=0},{x=0, -y=0}}

How to get Maple to realise that A and B are actually the same so that "{A} union {B}" would return "{{x=0, y=0}}" instead of above?

 

Thanks in advance.

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