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0 - 1 = -1
1 - 2 = -1
2 - 3 = -1
3 - 4 = -1
b)
2 - 4 = -2
3 - 5 = -2
4 - 6 = -2
5 - 7 = -2
c)
3 - 6 = -3
4 - 7 = -3
5 - 8 = -3
6 - 9 = -3