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Predicate predsort/3
 predsort(:Compare, +List, -Sorted) is det
Sorts similar to sort/2, but determines the order of two terms by calling Compare(-Delta, +E1, +E2). This call must unify Delta with one of <, > or =. If built-in predicate compare/3 is used, the result is the same as sort/2 (but sort/2 is built using more low-level primitives and is considerably faster).
See also
- keysort/2 provides an more portable way to sort on arbitrary keys that is usually faster. The predicate sort/4 can sort on specific arguments of compound terms or key values of dicts.
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