0,1,2,3,
01,02,03,10,12,13,20,21,23,30,31,32,
012,013,021,023,031,032,
102,103,120,123,130,132,
201,203,210,213,230,231,
301,302,310,312,320,321,
0123,0132,0213,0231,0312,0321,
1023,1032,1203,1230,1302,1320,
2013,2032,2103,2130,2301,2310,
3012,3021,3102,3120,3201,3210