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OK, you asked for it... myexpression=2 (p3 x12 x20 x25 - p3 x13 x20 x25 + p3 x13 x25^2 - p3 x12 x20 x26 + p3 x13 x20 x26 - p3 x12 x25 x26 - p3 x13 x25 x26 + p3 x12 x26^2 + x12 x20 x25 x27 - x13 x20 x25 x27 + x13...