<> (and #t #t) #t <> (or #t #t) #t <> (and #t #f) #f <> (or #t #f) #t <> (and #f #t) #f <> (or #f #t) #t <> (and #f #f) #f <> (or #f #f) #f <> (not #t) #f <> (not #f) #t (not (and #t #f))