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%% SPDX-License-Identifier: Apache-2.0
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[;1m  empty_set()[0m

  Returns the untyped empty set.

  [;;4mempty_set/0[0m is equivalent to [;;4mfrom_term([], ['_'])[0m.

[;1mExamples[0m

    1> sofs:to_external(sofs:empty_set()).
    []
    2> sofs:is_empty_set(sofs:empty_set()).
    true
