Amud 81a

תוס' ד"ה חוץ

Except from the shoots of an olive tree - חוץ מגרופיות של זית

Summary:
גרופיות according to רש"י means fists, while according to the ערוך it is the name of the olive tree branches.

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תוס' ד"ה ומעין

And the people of the city can utilize a spring which initially emerged - ומעין היוצא בתחילה בני העיר מסתפקין [ממנו]

Summary:
It is possible that only a naturally occurring spring is public property, but not one dug by the owner.

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תוס' ד"ה ומחכין

And they may go fishing in the sea of T’veryoh - ומחכין בימה של טבריא

Summary:
Everyone may fish בחכה, no one may fish בקלע, the בעלים may also fish במכמורות וברשת.

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תוס' ד"ה אין

We do not obligate him to uproot it - אין מחייבין אותו לעקור

Summary:
According to רש"י we do not obligate him to uproot the עשבים, since he will do it anyways, and according to תוספות there is no prohibition of even מקיים כלאים, since he is not pleased with the עשבים.

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תוס' ד"ה כאן

Here it is for its stalks - כאן לזירין

Summary:
The rule that a כלאים field is הפקר is only if the encroaching species is at least a 1/24th of the initial species.

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