2\1m*2+mn*2+2\1n*4
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2\1m*2+mn*2+2\1n*4
2\1m*2+mn*2+2\1n*4
2\1m*2+mn*2+2\1n*4
2\1m*2+mn*2+2\1n*4
=2\1(m^2+2mn^2+n^4)
=2\1(m+n^2)^2
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