وَإِلَّا يَجِبُ مَنْعُهُ كَ«زَيْنَبَ وَسَقَرَ وَمَاهَ وَجُورَ».
Translation: Otherwise it must be treated as a diptote, as with Zaynab, Saqar, Māh and Jūr.
This is about proper names with semantic femininity. Zaynab has more than three letters, Saqar has a moving middle letter, and the book cites Māh and Jūr as foreign names.