[1,2,11,12,21,22,111,112,121,122,211,212,221,222, 1111,1112,1121,1122,1211,1212,1221,1222,2111,2112, 2121,2122,2211,2212,11121,11122,11211,11212,11221, 11222,12111,12112,12121,12122,12211,12212,21111, 21112]