[0,1,10,11,12,100,101,110,111,112,120,121,122,123, 1000,1001,1010,1011,1012,1100,1101,1110,1111,1112, 1120,1121,1122,1123,1200,1201,1210,1211,1212,1220, 1221,1222,1223,1230,1231,1232,1233,1234,10000, 10001,10010,10011]