add.
a^2+2ab+b^2, a^2-2ab+b^2, a^2-ab-b^2
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a^2+2ab+b^2+a^2-2ab+b^2+a^2-ab-b^2
a^2+a^2+a^2+b^2+b^2-b^2+2ab-2ab-ab
3a^2+b^2-ab
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