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<> (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))
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