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  1. or download this
    p q ~p ~q p^q ~p v ~q ~( p ^ q )
T T  F  F  T     F         F
T F  F  T  T     F         F
F T  T  F  T     F         F
F F  T  T  F     T         T
  2. or download this
      unless ( lc($autosubmit) eq "y" or lc($autosubmit) eq "n" )