Commentary for Eruvin 154:10

ואמר רב נחמן אמר רבה בר אבוה

one balcony was built<span class="x" onmousemove="('comment',' Into the side of the wall.');">²⁴</span> above another balcony a valid reduction is thereby effected if either the lower one had an area<span class="x" onmousemove="('comment',' So according to Tosaf. Aliter: A length along the wall (Rashi) .');">²⁵</span> of four handbreadths [by four handbreadths]<span class="x" onmousemove="('comment',' And was built within three handbreadths from the ground and within ten handbreadths from the top of the wall. In this case the upper balcony may be completely disregarded.');">²⁶</span> or, where it was smaller,<span class="x" onmousemove="('comment',' Lit., 'also there is lot in the lower one four'.');">²⁷</span> if the upper one had an area of four handbreadths and there was no space of three handbreadths between them.<span class="x" onmousemove="('comment',' So that the two may be regarded as supplementary to each other and as a single unit effect the required reduction. If a greater distance than three handbreadths, however, separated them from each other they cannot be regarded as one unit and the reduction is invalid.');">²⁸</span> Similarly<span class="x" onmousemove="('comment',' Lit., 'and'.');">²⁹</span> R'Nahman citing Rabbah B'Abbuha ruled: A step-ladder<span class="x" onmousemove="('comment',' Lit., 'a ladder whose rungs fly', opposite to the steps of a staircase that are solidly built upon one another.');">³⁰</span> effects<span class="x" onmousemove="('comment',' For notes on this paragraph cf. notes on the case of balconies in the prev. one mut. mut.');">³¹</span> a reduction if the length of the lower rung was four handbreadths or, where it was shorter, if the upper one was four handbreadths long and there was no space of three handbreadths between them. R'Nahman further stated in the name of Rabbah B'Abbuha:

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