categories_of_rings

1 row where parent = "Set"

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Link internal_rings parent
Set,Ring Ring Set

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CREATE TABLE "categories_of_rings" (
	"internal_rings"	TEXT NOT NULL UNIQUE,
	"parent"	TEXT NOT NULL UNIQUE,
	FOREIGN KEY("parent") REFERENCES "categories"("name"),
	FOREIGN KEY("internal_rings") REFERENCES "categories"("name"),
	PRIMARY KEY("parent","internal_rings")
);