(x4 - 5)(x4 + 3) - x8 - 2x4 - 15, (x+2)(x+1)(x-2)(x-1) - x4 - 5x2 + 4, (x + 4)(x2 + 16)(x - 4) - x4 - 256, (x2 - 3)3 - x6 - 9x4 + 27x2 - 27, (x + 3)(x - 3)(x2 + 8) - x4 - x2 - 72, x4 + 5x2 - 24 - (x2 + 8)(x2 - 3),

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