Ta'arovot #42 - YD Shulchan Aruch Siman 110:10, כללי דיני ספק ספיקא בקצרה - Pri Chadash and Shach, Shulchan Aruch Siman 111:1 - Apr 28, 2021 - תערובות Hilchot Taarovot Shiur #42 - Yore Deah Shulchan Aruch Siman 110 Saif 10, Klalei HaSfekot - Pri Chadash and Shach, Shulchan Aruch Siman 111 Saifimg 1-2 -- Shach Kelale Sfek Sfeka Hakitzur, safek safeka, כללי דיני ספק ספיקא בקצרה, mithapech, Pri Chadash (Saif 13) where he disagrees with this Shach that requires it to mithapech, Yabia Omer Chelek 7 Siman 1 Ot 3