כִּי מָחֹה אֶמְחֶה אֶת זֵכֶר עֲמָלֵק
What does אֶמְחֶה stand for?
Hint: See Yalkut Reuvani or the Gra or the Chidah for amazing Remez
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The weekly "Torah Lodaas" sheet (by Rabbi Matis Blum of Queens, New York) for B'shalach 5771, quotes the book Gan Yosef, by the author of Pardes Yosef, as saying that the duplication is to indicate that although after erasing a mark is still visible, the erasure of Amalek must be even of that mark.
אמחה is the essential for Fighting amalek and winning which Happened three times lets see each case: The first is our Parsha Beshalach we had our main characters Involved Where
אהרן משה חור השם
אסתר מרדכי חרבונה השם