Why are there musafos (things added to the chazaras hashatz of musaf) for Shabas parashas sh'kalim and hachodesh but not zachor or para? (Or, at least, sidurim, including Rav Yaakov Emden's, have the former but not the latter.)
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This is a question that I am aware of that the Levush asked and left it as "there is a need for a reason why there was no Takana of Musafim for Parshas Zachor and Parshas Parah.
See link of Elya Raba 685:14