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1. f 1(x 1, x 2), f 7(x 1, x 2), f 13(x 1, x 2) f 14 (x 1, x 2). -2 .
2. f 1(x 1, x 2), f 8(x 1, x 2), f 11(x 1, x 2) f 13 (x 1, x 2). -2 .
3. f 3(x 1, x 2), f 6(x 1, x 2), f 10(x 1, x 2) f 15 (x 1, x 2). -2 .
4. f 5(x 1, x 2), f 6(x 1, x 2), f 9(x 1, x 2) f 11 (x 1, x 2). -2 .
5. f 4(x 1, x 2), f 6(x 1, x 2), f 13(x 1, x 2) f 15 (x 1, x 2). -2 .
6. f 6(x 1, x 2), f 7(x 1, x 2), f 10(x 1, x 2) f 12 (x 1, x 2). -2 .
7. f 3(x 1, x 2), f 8(x 1, x 2), f 10(x 1, x 2) f 13 (x 1, x 2). -2 .
8. f 5(x 1, x 2), f 6(x 1, x 2), f 13(x 1, x 2) f 15 (x 1, x 2). -2 .
9. f 3(x 1, x 2), f 6(x 1, x 2), f 10(x 1, x 2) f 14 (x 1, x 2). -2 .
10. f 5(x 1, x 2), f 8(x 1, x 2), f 6(x 1, x 2) f 14 (x 1, x 2). -2 .
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