8,9,10,11,

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8,9,10,11,
8,9,10,11,

8,9,10,11,
d b c

8,9,10,11, 8 9 10 11 8,9,10,11 8,9,10,11, 8,9,10,11 8 9 10 11 8 9 10 11 8,9,10,11 8,9,10,11, 8,9,10,11, 8,9,10,11, 7*8+8*9+9*10+10*11+11*12 8,9,10,11,12 8,9,10,11,12 7 8 9 10 11 8,9,10,11,12 7 8 9 10 11 7,8,9,10,11