protected static function get_permissions_name() {
        $strpermissions = array(
            CAP_INHERIT => get_string('inherit', 'role'),
            CAP_ALLOW => get_string('allow', 'role'),
            CAP_PREVENT => get_string('prevent', 'role'),
            CAP_PROHIBIT => get_string('prohibit', 'role')
        );
        return $strpermissions;
    }