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# set_range(?Set, -Lwb, -Upb)

Lwb and Upb are the current lower and upper bounds on Set
*Set*
- A variable or an integer list
*Lwb*
- List of integers
*Upb*
- List of integers

## Description

Returns two sorted, duplicate-free lists of integers which represent
the lower and upper bound of the set variable (or the ground set) Set.
The predicate can also be used as a test for set-variables, since it
fails for any other (in particular domain-less) variables.

### Fail Conditions

Set is a variable, but not a set variable