70 days between the letters based on the 70 days that the Egyptians mourned Yaakov (Yerushalmi). What is the connection? The Jewish people went to Achashveirosh’s party stating that Yaakov’s funeral was a legitimate precedent. They were wrong because Mordechai told them not to go. Our opinions are irrelevant. The Egyptians gave fake honor to Yaakov and the Jewish people were punished with a fake calamity. At Sasregan.

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