Mewbourne sent a letter that offers $600.00 per acre for a lease/assignment covering all of your right, title and interest in said unit, delivering an 81.25% net revenue interest; or no cash for a lease/assignment delivering 75% net revenue interest. Proposed well-Ambassador Inn “19/31” DM #1H. "If you wish to participate in the drilling of the proposed well by paying your proportionate share of costs, please sign…"We are not understanding what this letter is about. Can someone explain?