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local our %linked_counts_by_abbr;

...
        $linked_counts_by_abbr{$abbr} += $linked_count;
    }
})}x;

use XML::LibXML qw( );

...
    my $linked_count = $usage_node->getAttribute('LinkedCount');
    $linked_counts_by_abbr{$abbr} += $linked_count;
}