∀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
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