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

  Returns the strict relation corresponding to the binary relation [;;4m[0m
  [;;4mBinRel1[0m.

[;1mExamples[0m

    1> R1 = sofs:relation([{1,1},{1,2},{2,1},{2,2}]).
    2> R2 = sofs:strict_relation(R1).
    3> sofs:to_external(R2).
    [{1,2},{2,1}]
