x2 * x5 - x7, (x10)3 - x30, x11 ➗ x5 - x6, (x*y)3 - x3 *y3, x0 - 1, x2➗x3 - x-1, x1 - x, x2*x3*x4 - x9, (x2y)3 - x6y3,

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