category,category_label,construction,construction_label
Ab,Ab,pullback,pullback
CRing,CRing,pullback,pullback
Comp,Comp,pullback,pullback
DGph,DGph,pullback,pullback
FinGrp,FinGrp,pullback,pullback
FinSet,FinSet,pullback,pullback
Grp,Grp,pullback,pullback
Quiv,Quiv,pullback,pullback
Set,Set,pullback,pullback
Top,Top,pullback,pullback