(
  (
    ($hash{AUTHOR} eq 'John' and $hash{PROFIT} eq '90%')
or
    ($hash{AUTHOR} eq 'Matt' and $hash{PROFIT} eq '80%')
  )
and
  $hash{PUBLISHER} eq 'OReilly'
)


##</code><code>##

%hash=(
AUTHOR=> 'John',
PROFIT=> '20%',
PUBLISHER=> 'TMH',
BOOK=> 'OPERATING SYSTEMS'
)