01234,01235,01236,01237,01238,01239,12345,12346,12347,12348,12349,23456,23457,23458,23459,34567,34568,34569,45678,45679,56789,67890,67891,67892,67893,67894,67895。
哎，太简单了，就是10个里面取5个的组合数：C（10,5）=252种
