22 rows where construction = "initial object"

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Link category construction
Ab initial object
Ban_k initial object
BoolAlg initial object
CRing initial object
Circ initial object
Diff initial object
Eff initial object
FinGrp initial object
FinHilb initial object
FinSet initial object
FinVect_k initial object
Grp initial object
Hilb initial object
Met initial object
Mod(Ab) initial object
Ring initial object
Rng initial object
SSet initial object
Set initial object
Set* initial object
Top initial object
Vect_k initial object

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CREATE TABLE "categorical_structure" (
	"category"	TEXT NOT NULL,
	"construction"	TEXT NOT NULL,
	FOREIGN KEY("construction") REFERENCES "universal_objects"("construction") on update cascade on delete restrict,
	FOREIGN KEY("category") REFERENCES "categories"("name") on update cascade on delete restrict,
	PRIMARY KEY("category","construction")
);