Commentary for Eruvin 155:5

אמר רב הונא עמוד ברה"ר גבוה עשרה ורחב ארבעה ונעץ בו יתד כל שהוא מיעטו

R'Hisda observed: This,<span class="x" onmousemove="('comment',' That the two projections form, valid reduction.');">¹²</span> however, applies only where they are not situated exactly one above the other.<span class="x" onmousemove="('comment',' So that it is possible to connect the two to each other by means of a second ladder.');">¹³</span> R'Huna ruled: If in a public domain there was a post ten handbreadths high and four handbreadths wide<span class="x" onmousemove="('comment',' Sc. four by four. A post of such dimensions constitutes a private domain from which into the public domain and from the public domain into which the movement of objects on the Sabbath is forbidden.');">¹⁴</span>

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