Commentary for Eruvin 154:8

אמר רב ביבי בר אביי בנה איצטבא על גב איצטבא אם יש באיצטבא התחתונה ארבעה ממעט אי נמי אין בתחתונה ארבעה ויש בעליונה ארבעה ואין בין זה לזה שלשה ממעט

but if there was a distance of three handbreadths between them,<span class="x" onmousemove="('comment',' Sc. that it would not be very easy to gain access from one courtyard into the other.');">¹⁹</span> no valid reduction is effected. This, however, applies only where the wall was less than four handbreadths thick but if it was four handbreadths thick<span class="x" onmousemove="('comment',' In consequence of which it is quite convenient to walk along the top of the wall.');">²⁰</span>

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