Sforno on Genesis 45:23/ספורנו על בראשית מ״ה:כ״ג

1ולאביו שלח כזאת, similar to the gifts given to Binyamin. In addition he sent ten donkeys and ten she-asses. In the plural mode the letter ו indicating who else is included appears at the end [the last word in the sequence. Ed.} Examples of such constructions are: .Exodus 1,2 יששכר זבולון ובנימין.