Erasing Amail is a persistent Mitzvah due to his evil nature. he is חוצפא כמלכא בלי תגא and he adds his Chutzpa to the seventy nations who by themselves would be redeemable. To defeat them you need a power above reason and this is (1) the idea of זכור (masculine and bever changing) and (2) מינוי מלך (which is all aboput Bittul) before we take on Amalaik.
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