$HASH1 = {
           cheeseBurger       => 'burger',
           cheeseSandwich     => 'sandwich',
           doubleCheeseBurger => 'burger',
           tomatoSandwich     => 'sandwich'
         };
$HASH2 = {
           burger   => [
                         'cheeseBurger',
                         'doubleCheeseBurger'
                       ],
           sandwich => [
                         'cheeseSandwich',
                         'tomatoSandwich'
                       ]
         };