a: a man who has three wives
b: a woman who has three husbands, all of whom are brothers
c: a man who marries, then divorces, then marries again, then divorces again, then marries again, each time to a different woman
d: a man who has three wives, all of whom are sisters
e: a man who has two wives, one of whom is biologically female, while the other is biologically male, but is regarded as having the spirit of a woman