8m - 12mn - 4m(2 - 3n), 8n - 12mn - 4n(2 - 3m), 8mn - 12m - 4m(2n - 3), 8mn - 12mn - -4mn, 2s2 - 6s - 2s(s - 3), m2 - 2m - 3 - (m+1)(m-3), m2 - 1 - (m+1)(m-1), 5n - 20 - 5(n - 4), -4n - 28 - -4(n + 7), 4n+28 - 4(n + 7),

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