Subsets of {0,1,2,3}

Code	Subset
01	{0,1}
02	{0,2}
03	{0,3}
10	Same as {0,1}
12	{1,2}
13	{1,3}
20	Same as {0,2}
21	Same as {1,2}
23	{2,3}
30	Same as {0,3}
31	Same as {1,3}
32	Same as {2,3}