The rights of each of Owners and Buyer under this Agreement are cumulative and may be exercised as often as such party considers appropriate. The rights of each of Owners and Buyer under this Agreement will not be capable of being waived or varied otherwise than by an express waiver or variation in writing. Any failure to exercise or any delay in exercising any of such rights will not operate as a waiver or variation of that or any other such right. Any defective or partial exercise of any of such rights will not preclude any other or further exercise of that or any other such right. No act or course of conduct or negotiation on the part of any party will in any way preclude such party from exercising any such right or constitute a suspension or any variation of any such right.