Reference for Eruvin 85:9

בעי רב חנניא יש תחומין למעלה מעשרה או אין תחומין למעלה מעשרה

R'Ashi said: The inference from our Mishnah also proves [that the dispute between the Tannas mentioned relates to a stationary ship]. For SHIP was mentioned in the same way as A CATTLE-PEN and A CATTLE-FOLD; as a cattle-pen and a cattle-fold are stationary, so is the ship mentioned, one that was stationary.

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