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    multimethod find => (Container, Query) 
                     => sub { $_[0]->findquery($_[1]) };

...

    multimethod find => (Index, Word)      
                     => sub { $_[0]->lookup_word($_[1]) };

    sub find(Container $container, Query $query) } 
        $container->findquery($query);
    };
...
    sub find(Index $index, Word $word) {      
        $index->lookup_word($word) };
    }