1. X={0,1,2,3,4,5}; G: |x-y|>=3;
2. X={0,1,2,3,4,5}; G: |x-y|=2;
3. X={0,1,2,3,4}; G: |x+y|>=3, xy;
4. X={0,1,2,3,4,5}; G: |x-y|>=2;
5. X={1,2,3,4,5,6}; G: |x+y|>=2;
6. X={1,2,3,4,5}; G: 5<=|x+y|<=8
7. X={1,2,3,4,5,6}; G: 2y<=x, 2x<=y;
8. X={1,2,3,4,5}; G: |x-y|=3;
9. X={1,2,3,4,5,6}; G: |x-y|=1, |x-y|=4;
10. X={1,2,3,4,5}; G: 1<=|x-y|<=3;
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11. X={1,2,3,4,5}; G: 3<=x+y<=5;
12. X={1,2,3,4,5}; G: 3<=x+y<=4;
13. X={0,1,2,3,4,5}; G: |x+y|>=2;
14. X={1,2,3,4,5,6}; G: |x-y|<3;
15. X={1,2,3,4,5}; G: 5<=|x+y|<=8;
16. X={0,1,2,3,4}; G: |x+y|>=3, xy;
17. X={0,1,2,3,4,5}; G: |x-y|>=2;
18. X={1,2,3,4,5,6}; G: |x+y|>=2;
19. X={0,1,2,3,4,5}; G: 2<=|x-y|<=4;
20. X={1,2,3,4,5}; G: 4<=x+y<=5.
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