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After the Amida on Kol Nidrei night, there are a few paragraphs of Selichot that are said. The 3rd or 4th starts with the words Omnon Ken - and the Aaron HaKodesh is opened while saying it - hence "pesicha of Omnon Ken". It's on page 175 of the Interlinear ArtScroll Yom Kippour Machzor, Ashkenaz edition.
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