This Agreement constitutes the sole and entire agreement among the parties hereto and no modification of this Agreement shall be binding unless in writing and signed by Seller, Operator and Buyer. No signature of Title Insurer shall be required to amend this Agreement except for an amendment modifying the terms of Section 8 of this Agreement. No prior agreement or understanding pertaining to the subject matter hereof (including, without limitation, any letter of intent executed prior to this Agreement) shall be valid or of any force or effect from and after the date hereof. Any rule of construction which provides that ambiguities are to be resolved against the drafting party shall not apply to the interpretation of this Agreement.