Amud 99a

תוס' ד"ה שתי

Two balconies, etc. - שתי גזוזטראות כולי

Summary:
A protruding balcony 'למעלה מי is a רה"י if either it has walls below it or above it.

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תוס' ד"ה בין

There was a full length of a wagon between a wagon and a wagon - בין עגלה לעגלה כמלא אורך עגלה

Summary:
Mentioning the length of the עגלה was לסימנא בעלמא.

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תוס' ד"ה כי

In order not to crowd the beams - כי היכי דלא לידחקו קרשים

Summary:
The reason four and a half אמות was insufficient is because of the concern that the קרשים (because of their weight) may shift and press against the טבעות and compress them.

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תוס' ד"ה למה

Why do I need it; one Ah’moh and a half is sufficient - למה לי באמתא ופלגא סגי

Summary:
According to רש"י, each עגלה had a separate load of קרשים with a (large) overhang. However according to תוספות, two attached עגלות carried one load of קרשים with no overhang

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תוס' ד"ה אמתא

There was an extra cubit - אמתא יתירא הואי

Summary:
The בן לוי had an אמה on the side of the עגלה which needed adjusting. And would steer the עגלות to the other side of the רה"ר. He would be able to adjust the קרשים despite the fact that he was two and a half אמות distant

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תוס' ד"ה מסייע

This is a support to Rabi Yochonon, who maintains the pit and its bank combine for ten טפחים, etc. - מסייע ליה לרבי יוחנן דאמר בור וחולייתה מצטרפין לעשרה

Summary:
The משנה is either teaching us that the walls of the pit and its bank combine for ten טפחים or that the airspace of the pit and the width of the rim combine for דע"ד.

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