Four couples—the Potters, the Regans, the Stewarts, the Wilsons—are seated evenly spaced about a circular table.
The Regans do not sit next to the Stewarts.
The Stewarts sit next to each other.
Mr. Potter sits directly opposite Mr. Wilson.
If Mr. Potter is between and next to Mr. Stewart and Mrs. Wilson, then how many different seating arrangements of the eight people are possible?