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2. (ab-8c)(ab+8c)
3. (x2-13)(x^2+13)
4. (a^4-1)(a^4+1)
5. (x^2-m^4)(x^2+m^4)
6. (7a^2b^2-4c^2)(7a^2b^2+4c^2)
7. (6a^4+10b^9)(6a^4-10b^9)
8. (14c^2-11d^3c^3)(14c^2+11d^3c^3)
9. (15a-12b)(15a+12b)