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

  Returns the intersection of the set of sets [;;4mSetOfSets[0m.

  Intersecting an empty set of sets exits the process with a [;;4mbadarg[0m
  message.

[;1mExamples[0m

    1> S1 = sofs:set([a,b,c]).
    2> S2 = sofs:set([b,c,d,e]).
    3> S3 = sofs:set([a,b,c,d]).
    4> S4 = sofs:from_sets([S1,S2,S3]).
    5> S5 = sofs:intersection(S4).
    6> sofs:to_external(S5).
    [b,c]
    7> S6 = sofs:from_sets([]).
    8> sofs:intersection(S6).
    ** exception error: bad argument
         in function  sofs:intersection/1
