4.4If any of the provisions of this agreement becomes invalid or unenforceable, this shall not effect or impair the validity of the remaining provisions. The invalid or unenforceable provision shall be replaced by the parties hereto with a provision which ensures, as far as possible, the economic purpose of the invalid or unenforceable provision.4.5This agreement has been executed in two counterparts in the English language, one counterpart for each of the parties.