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Container      = SharedHouse
Element        = Person
->do_something = ->pay_rent

my $cont = SharedHouse->new('Prag');
my $elem = Person->new('Egon');
...

# method chaining
$cont->get_elem('Egon')->pay_rent();

$elem1 = $cont1->get_elem('Egon');
$elem2 = $cont2->get_elem('Egon');