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%% SPDX-License-Identifier: Apache-2.0
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[;1m  restriction(BinRel1, Set)[0m

  Returns the restriction of the binary relation [;;4mBinRel1[0m to [;;4mSet[0m.

[;1mExamples[0m

    1> R1 = sofs:relation([{1,a},{2,b},{3,c}]).
    2> S = sofs:set([1,2,4]).
    3> R2 = sofs:restriction(R1, S).
    4> sofs:to_external(R2).
    [{1,a},{2,b}]
