Commentary for Eruvin 155:6

אמר רב אדא בר אהבה ובגבוה שלשה אביי ורבא דאמרי תרוייהו אף על פי שאין גבוה שלשה

and a peg of the smallest size had been inserted on it,<span class="x" onmousemove="('comment',' In its surface on the top so that uppermost area was reduced to one of less than four handbreadths.');">¹⁵</span> a valid reduction is thereby effected.<span class="x" onmousemove="('comment',' The post loses the status of a private domain.');">¹⁶</span> R'Adda B'Ahabah observed: Provided the peg was three handbreadths high.<span class="x" onmousemove="('comment',' if it was smaller it is regarded as part of the surface of the top of the post.');">¹⁷</span>

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