every %1$S of %2$S;every #3 years on every %1$S of %2$S
gach %1$S de %2$S;gach #3 bhliain ar gach %1$S de %2$S;gach #3 bliana ar gach %1$S de %2$S;gach #3 mbliana ar gach %1$S de %2$S;gach #3 bliain ar gach %1$S de %2$S