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 zt'l 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.