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    unless (defined $db_dir_qfn && -d $db_dir_qfn) {
    
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    $db_dir_qfn = realpath('db') unless defined $db_dir_qfn && -d $db_dir_
    +qfn;
    
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    defined $db_dir_qfn && -d $db_dir_qfn
       or $db_dir_qfn = realpath('db');