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Why is 'misod chachomim unevonim' sometimes said and sometimes omitted in the repetition of the Amidah?

In Askenazi communities, the piece beginning 'misod chachomim unevonim' is said at the repetition of the Amidah at Shacharis when there are piyuttim (except Purim) and on Musaf on Yomim Noraim as well ...