package Foo;
  sub shared { print "Shared method" }
  sub foozle { print "Foo's foozle" }

  package Bar;
  sub foozle { print "Bar's foozle" }

  package Blip;
  sub foozle { print "Blip's foozle" }

  package FooBar;
  @ISA = qw( Bar Foo );

  package FooBlip;
  @ISA = qw( Blip Foo );