private function idExists($id, &$yAlreadySet, &$realNameId) {
        $yFound = isset($id[3]) && $id[3] === 'y';
        $idVarAdded = substr($id, 0, -1) . 'y';

        if (isset($this->identifiersAi[$id])) {
            if ($yFound) {
                $yAlreadySet = false;
            }

            $realNameId = $id;
            return true;
        } elseif (!$yFound && isset($this->identifiersAi[$idVarAdded])) {
            /* if the id don't exist, we try to find this id with "y" at the last char */
            $yAlreadySet = true;
            $realNameId = $idVarAdded;
            return true;
        }

        return false;
    }