a2-b2+n2+d2+m2+2ab+d2
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a2-b2+n2+d2+m2+2ab+d2
a2-b2+n2+2d2+m2+2ab
a2-b2+m2+n2+2d2+2ab
a2-b2+m2+n2+2(d2+ab)
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