Return from where, or are you after all the possible permutations from A,B,C? I doubt that you have captured all the possible results from A,B,C, for example
I'm looking for all combinations (order doesn't matter) of A, B, C including groups of 1 item, 2 items or 3 items.
You are correct -- I was missing B, C and <null>. The spreadsheets and links below actually don't address this problem/I'm not smart enough to figure out how to modify them to address this issue.
A, B, C
A, C
A, B
B, C
A
B
C
<null>
A, B, C has 8 solutions
A, B, C, D has 16 solutions.
A, B, C, D, E has 32 solutions.
A, B, C, D, E, F has 64 solutions.