The Three Levels of Bitul - Part 2

From B'yam Darkecha on the Beauty of Shabbos & the Yomim Tovim: R Yossi Michalowicz by R Yossi Michalowicz.

pp. 254 - 259: Understanding the concepts of "Yichuda Tata'ey" & "Yichuda Ela'ey"; "Memalei Kol Olmin" & "Sveiv Kol Almin" amongst others