Reference for Shabbat 223:2

מפתח חלוקה: פשיטא לא צריכא דאית ליה תרי דשי מהו דתימא חדא מינייהו בטולי מבטיל קא משמע לן:

you might say, One of these is disregarded:<span class="x" onmousemove="('comment',' I.e., when she removes it she may leave one pair tied, which makes it permanent knot; since we do not know which may be left, both should be forbidden. ');">³</span> hence he informs us [that we do not fear this]. AND THE RIBBONS OF HER HAIR-NET. But that is obvious? — This is necessary [to teach] only where it is roomy:<span class="x" onmousemove="('comment',' Not closely fitting, so that it can be removed from the head even when tied. ');">⁴</span>

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