M2

4 - r1r^60 + 15m(n2 + m2)] - 20wa(1 - r1)(n + 2m) - 15r1wa [(n + m)2 + 2m2] + Wb(2 + r1) [3(m - n)3 + 15n(m2 + n2)] -20wb(1 - r1)(m + 2n)- 15r1Wb [(m + n)2 + 2n2] } (M1 + M2) (n - m)L

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