ab-a^3, a^2(b-a), a(b-a^2), b^4(a^4–b^5), a^4b^4-b^9, a^5b^4-b^1, x^6x^3, x^8, x^9, bb^7+aa^2–a^3+b^4, b^8+b^6, b^8+b^4, bb-a+b+a, b^6, b^3.

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