Combination, Not Permutation, Algorithm

[SleepDepD]

I'm looking for a combinatorial algorithm written in VB; a function that would list every possible combination of characters in a given string "ABC". I've found a lot of algorithms outputting permutations:

ABC,BCA,CAB,...

but none of all combinations

A,AB,ABC,...

If anyone has one, I would appreciate the help.

 

[JohnYingling]

Think binary. In "All Combinations", a letter is either In or Out ("on" or "Off"). For "ABC", it is 0 thu 7(2^3 - 1)..."A" if 4 is on, "B" if 2 is on and "C" if 1 is on.
0="",1="C",2="B",3="BC",4="A",5="AC",6="AB",7="ABC"

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