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练习四,7,8,9,7,8,9,8,8,9,9,9,9,6,6,1,1,2,1,3,4,1,3,4,1,5,6,11,-,5,6,13,-,4,9,11-2=9,11-3=8,11-4=7,11-5=6,12-3=9,12-4=8,12-5=7,13-4=9,13-5=8,8,7,6,7,6,7,8,6,5,8,7,6,12,-,5,7,8,4,9,6,9,3,6,9,11,18,5,14,16,6,6,13,19,4,7,2,14,4,4,13,-,9,4,4,13,-,4,9,