{
    my %gid;

    sub gid($)
    {
        my $group = shift;
        defined $gid{$group} && return $gid{$group};
        my $t = getgrnam($group);
        $gid{$group} = ${ $t }[2];
        return $gid{$group};
    } 
}
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~Particle ;Þ