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How many distinct Boolean functions f(P,Q,R)f(P, Q, R)f(P,Q,R) exist that satisfy the self-dual property f(¬P,¬Q,¬R)=¬f(P,Q,R)f(\neg P, \neg Q, \neg R) = \neg f(P, Q, R)f(¬P,¬Q,¬R)=¬f(P,Q,R) and have f(T,T,T)=Tf(T, T, T) = Tf(T,T,T)=T?