1,2,3,4,5,6,11,12,13,14,15,16,21,22,23,24,25,26,31,32,33,34,35,36,41,42,43,44,45,46,51,52,53,54,55,56,61,62,63,64,65,66,111,112,113,114,115,116,211,222,333,