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 html
...
        |   |   `-- rev2
        |   |       `-- DEMO_top_DV_rev2_.html

  html
    `-- DEMO
...
        |   |   `-- rev2
        |   |       `-- DEMO_top_DV_rev2_.html

my $location = $output_dir;
open LOGFILE, $location;
...
        }
    }
}