Elu eser makot, These are the ten plagues which the Holy one brought upon the Egyptians who were in Egypt: The verse says “On the Egyptians” meaning to exclude the Israelites. None of the ten plagues affected the Israelites; these are the ten wonders which God performed for the Israelites in Egypt. The Haggadah then says “In Egypt” to exclude those plagues which God performed at the Red Sea. At the sea God struck Egypt with fifty plagues! This passage seems to agree with the opinion of Rabbi Yose, above. The Haggadah then goes on to list the plagues in an abbreviated form: d’tzach adash ba’achab in order to show how He struck the Egyptians and saved the Israelites. This is what Rabbi Samson said in the name of the Ari : Each time God struck the Egyptians, He healed Israel a little more. The abbreviation of the plagues was a mystical mantra – they are names which had the power to heal the people of Israel. By transposing the letter so that the three first letters make the word da’ab, the three middle letters make the word tzada, and the final letters make up the word chash’chab