An exclusive club is trying very hard to pick its members from the social elite. An exact election mechanism has been agreed upon that will ensure the entrance of only the most suave members from the group , , , , , , and . Being ‘in’ or ‘out’ of the club is determined by the following rules : If is in, then is out. If is out, then is in. If is out, then is out. If is in, then is in. If is out, then and are out.
If and are in the club, then what other two people must also be in the club?
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