function prep_data($data)
{
        if(is_array($data))
        {
                foreach($data as $key=>$value)
                {
                        if(is_array($value))
                        {
                                $keys[] = prep_data($value);
                        }
                }
        }
        else
        {
                return '_' . $data;
        }
        return $data;
}

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