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∀p∈{people}( ∃t∈{time}( Person 'p' can be fooled at time 't' ) )
∃p∈{people}( ∀t∈{time}( Person 'p' can be fooled at time 't' ) )
¬( ∀p∈{people}( ∀t∈{time}( Person 'p' can be fooled at time 't' ) ) )
-- Abe Lincoln
(Or words to that effect.)