sub DirPo {
    use Errno qw/ EACCES /;    # permission denied
    my $word    = "site";
    my $counter = 1;
    my $made    = 0;
    my $name    = sprintf '%s%3d', $word, $counter;    ## ONE, PEE
    while ( not $made = mkdir $name, 0755 ) {
        die $! if $! == EACCES;
        $name = sprintf '%s%3d', $word, $counter;      ## TWO, EEW
    }
    return $name if $made;
    return;
}