(a+b+c)(b+c-a)(c+a-b)(a+b-c)
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(a+b+c)(b+c-a)(c+a-b)(a+b-c)
a+b+c+b+c-a+c+a-b+a+b-c
a+a+b+b+c+c(as there were some
variables which had to be cancelled)
2a+2b+2c
2(a+b+c)
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