[0,1,2,11,12,21,22,30,111,112,121,122,130,211,212, 221,222,230,301,302,310,320,1111,1112,1121,1122, 1130,1211,1212,1221,1222,1230,1301,1302,1310,1320, 2111,2112,2121,2122,2130,2211,2212,2221,2222,2230, 2301,2302]