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# potential_members(?Set, -List)

List is the list of elements of whose membership in Set is currently uncertain

Set
  a set or set variable
List
  variable, will be unified with a list

### Exceptions

(4) instantiation fault
  Set is a variable, but not a set variable

## Examples

        	?- S :: [2,4]..[1,2,3,4,5], potential_members(S, P).
    	S = S{[2, 4] \/ ([] .. [1, 3, 5]) : _{[2 .. 5]}}
    	P = [1, 3, 5]