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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]