The Numeral four (catu-, masculine):
Pl.
Nom.
cattāro/caturo
Acc.
cattāro/caturo
Gen.
catunnaṃ
Dat.
catunnaṃ
Ins.
catūhi/catūbhi/catubbhi
Abl.
catūhi/catūbhi/catubbhi
Loc.
catūsu