Responsa for Yevamot 67:1

ומאן האי תנא דאית ליה איסור כולל ואיסור מוסיף ואיסור בת אחת

And who is this Tanna<span class="x" onmousemove="('comment',' In our Mishnah. ');">¹</span> that admits the force<span class="x" onmousemove="('comment',' Lit., 'to whom there is'. ');">²</span> of a 'comprehensive prohibition', a 'prohibition of a wider range' and 'simultaneous prohibitions'?<span class="x" onmousemove="('comment',' Wherever they can all be applied to the same person. If, e.g., A the brother of B betrothed C the sister of D, C is forbidden to B as 'his brother's wife' and as 'a married woman', both prohibitions having come into force simultaneously. If B subsequently betrothed D, her sister C becomes forbidden to him, by the comprehensive prohibition of 'his wife's sister', (comprehending all the sisters of D inclusive of C). When C becomes a menstruant she is forbidden to B as a menstruant also, this last being a prohibition of a wider range extending as it does the prohibition of the woman to A also. ');">³</span>

Teshuvot Maharam