[1,2,3,11,12,13,21,22,23,31,32,33,111,112,113,121, 122,123,131,132,133,211,212,213,221,222,223,231, 232,233,311,312,313,321,322,323,331,332,333,1111, 1112,1113,1121,1122,1123,1131,1132,1133,1211,1212, 1213,1221]