categories_of_semigroups
1 row where parent = "Set"
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CREATE TABLE "categories_of_semigroups" ( "internal_semigroups" TEXT NOT NULL UNIQUE, "parent" TEXT NOT NULL UNIQUE, FOREIGN KEY("parent") REFERENCES "categories"("name"), FOREIGN KEY("internal_semigroups") REFERENCES "categories"("name"), PRIMARY KEY("parent","internal_semigroups") );