最小数是0最大数是20的话,第二位可以是1,2,3,4.5,6,7.即为0,1,410,11,12,13,14,15,16,17,18,19,20.或0,2,3,10,11,12,13,14,15,16,17,18,19,20.或0,3,4,8,11,12,13,14...20或0,4,5,6,11,12,13,14,15,16,17,18,19,20或0,5,6,7,8,12,13,14...20.或0,6,89,10,11,12,13,14,15,16,17,19,20或0,7,8,9,10,11,12,13,14,15,16,17,18,20
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