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[Merged by Bors] - chore(SetTheory/Cardinality/Cofinality/Club): use namespace #226542

[Merged by Bors] - chore(SetTheory/Cardinality/Cofinality/Club): use namespace

[Merged by Bors] - chore(SetTheory/Cardinality/Cofinality/Club): use namespace #226542