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# ord_proper_subset(+Set1, +Set2)

Checks whether Set1 is a proper subset of Set2

Set1
  A set
Set2
  A set

## Description

Succeeds when every element of the ordered set Set1 appears in the ordered set Set2, and Set2 has at least on element that does not occur in Set1.

### Modes and Determinism

- ord_proper_subset(+, +) is semidet

## See Also

ord_subset / 2, ord_compare / 3