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- 1. 2-9=-7 3-9= -6 4-9= -5 5-9= -4 6-9= -3 7-9= -2 8-9= -1 9-9= 0 2-8=-6 3-8= -5 4-8= -4 5-8= -3 6-8= -2 7-8= -1 8-8= 0 9-8= 1 2-7=-5 3-7= -4 4-7= -3 5-7= -2 6-7= -1 7-7= 0 8-7= 1 9-7= 2 2-6=-4 3-6= -3 4-6= -2 5-6= -1 6-6= 0 7-6= 1 2-5=-3 3-5= -2 4-5= -1 5-5= 0 6-5= 1 2-4=-2 3-4= -1 4-4= 0 5-4= 1 2-3=-1 3-3= 0 4-3= 1 2-2=0 3-2= 1 2-1=1