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In the Steipler's Shiurin shel Torah he writes the Chazon Ish's opinion about the amount needed for each Mitzvah. When it is a Mitzva D'Oraisa like Sukkah, he uses 10cm as a Tefach - 60cm as an amah , but when it is a question of a D'Rabannan as seen in the topic of Ma'aka/fence on a roof (in a D'Rabbanan situation b'shas ha'dchak) he uses 9.6cm as a tefach -...

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