If B = 7, there are several conditions that a is less than or equal to B is less than or equal to C B = 7, a is less than or equal to B is less than or equal to C B = 7
(1) When B = 7, and a < B < C, a = 1, C = b = 7, a = 2, B = 7, C = 8, a = 3, B = 7, C = 8,9a = 4, B = 7, C = 8,9,10a = 5, B = 7, C = 8,9,10,11a = 6, B = 7, C = 8,9,10,11,12
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