a4⋅a7 - a11, (c5)3 - c15, x12:x3 - x9, (2xy)3 - 8x3y3, (nm​)5 - n5m5, b⋅b8 - b9, 32⋅3⋅32 - 243, (−4a3)2 - 16a6,

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