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# ?Set in_set_range ++Lwb..++Upb

Set is an integer set within the given bounds
*Set*
- A free variable, set variable, array reference, or an integer list
*Lwb..Upb*
- Structure holding two lists of integers

## Description

Lwb and Upb are two lists of integers. Lwb must be a sublist of
Upb. Set is unified with a set variable whose lower bound is the
set of list elements of Lwb, and whose upper bound is the set of
list elements of Upb.

### Fail Conditions

Lwb is not a sublist of Upb
### Exceptions

*(5) type error *
- Set is not a variable, array reference, or list, or Lwb..Upb is not a ../2 structure

## See Also

intset / 3, intsets / 4