The Employer and the Association acknowledge that during the negotiations which resulted in this Agreement each had the unlimited right and opportunity to make demands and proposals with respect to any subject or matter not removed by law from the area of collective bargaining, and that the understanding and agreements arrived at by the parties after the exercise of that right and opportunity are set forth in this Agreement. Therefore, the Employer and the Association for the life of this Agreement each voluntarily and unqualifiedly waives the right, and agrees the other shall not be obliged, to bargain collectively with respect to any subject or matter referred to or covered in this Agreement, or with respect to any subject or matter referred to in the negotiation of this Agreement.