 There are more than a dozen casinos in Cairo, mostly in the major hotels, and they attract a number of serious  high rollers.  
You have to be a member to join the casino's in Cairo hotels.
mnli hypothesis: You have to be a member to join the casino's in Cairo hotels. premise:  There are more than a dozen casinos in Cairo, mostly in the major hotels, and they attract a number of serious  high rollers.  