[0,1,2,3,11,12,13,21,22,31,101,102,103,111,112, 113,121,122,201,202,211,212,221,301,311,1001,1002, 1003,1011,1012,1013,1021,1022,1031,1101,1102,1103, 1111,1112,1113,1121,1122,1201,1202,1211,1212,1301, 2001,2002,2011]