Enissay

In a function I receive a string filter which can be equal to:
- "All", which is equivalent to "A+B+C"
- Any combination of A, B and C spearated by a "+", ie: A+B, B+C, B, ...


				A | B | C
All:				x   x   x
any combination is possible:	x   x
				x       x
				    x   x
				x
				    x
				        x

In each case, a code is to be executed