[1,2,10,20,100,101,200,201,1000,1001,1002,1010, 2000,2001,2002,2010,10000,10001,10002,10010,10020, 10100,10101,20000,20001,20002,20010,20020,20100, 20101,100000,100001,100002,100010,100020,100100, 100101,100200,100201]