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1 - 2 = - 1
4 - 5 = - 1
17 - 18 = - 1
23 - 24 = - 1
b)
7 - 9 = - 2
8 - 10 = - 2
14 - 16 = - 2
30 - 32 = - 2
c)
9 - 12 = -3
15 - 18 = - 3
27 - 30 = - 3
33 - 36 = - 3