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Come on. Executing someone based on a mere suspicion is the same as executing them based on flimsy evidence.
By the way, we should calculate the possible number of Mafia players and hidden town roles.
There are seventeen roles in total. Ten of them are known town roles. Since the lone wolf doesn't specify a number, it's likely there's only one. That leaves six.
How many of them could be Mafia members and hidden town roles?