[1,11,12,111,112,121,122,123,1111,1112,1121,1122, 1123,1211,1212,1221,1222,1223,1231,1232,1233,1234, 11111,11112,11121,11122,11123,11211,11212,11221, 11222,11223,11231,11232,11233,11234,12111,12112, 12121]