SWI-Prolog -- is_ordset/1

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Predicate is_ordset/1

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Availability::- use_module(library(ordsets)).(can be autoloaded)

Source

[semidet]is_ordset(@Term)

True if Term is an ordered set. All predicates in this library expect ordered sets as input arguments. Failing to fullfil this assumption results in undefined behaviour. Typically, ordered sets are created by predicates from this library, sort/2 or setof/3.