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my $page1 = My::Page->create({ location => 'abc' });
my $page2 = $page1->add_to_inbound({ location => 'def' });

my $page1 = My::Page->create({ location => 'abc' });
my $page2 = My::Page->create({ location => 'def' });
...
             [$page2->inbound()],
             [$page2->outbound()],
             );