%% %CopyrightBegin%
%%
%% SPDX-License-Identifier: Apache-2.0
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%% Copyright Ericsson AB 2021-2025. All Rights Reserved.
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[;1m  union_of_family(Family)[0m

  Returns the union of family [;;4mFamily[0m.

[;1mExamples[0m

    1> F = sofs:family([{a,[0,2,4]},{b,[0,1,2]},{c,[2,3]}]).
    2> S = sofs:union_of_family(F).
    3> sofs:to_external(S).
    [0,1,2,3,4]
