(a) The parties to a bilateral contract are required to render their respective performances simultaneously, unless they have agreed on or circumstances indicate a different order of performance.
(b) If performance of an obligation by one party is dependent upon performance of another obligation arising out of the same contract by the other party, each party may withhold performance until tender of performance by the other party. Where one party has performed in part, the other party cannot refuse to perform if to do so would be contrary to good faith, having regard in particular to the relatively slight or trivial nature of the default ("exceptio non adimpleti contractus", "inadimplenti non est adimplendum").
Each Seller irrevocably waives any rights of pre-emption conferred on them by the Articles of Association of the Company or otherwise over any of the Sale Shares. Buyer shall not be obliged to complete the purchase of any of the Sale Shares unless the purchase of all the Sale Shares is completed simultaneously.