The parties agree that this Agreement in all respects supplants all particular provisions of the following General Laws of the Commonwealth of Massachusetts and the Rules and Regulations thereto and any future rules and regulations promulgated thereunder namely: the Second Paragraph of Section Twenty-Eight of Chapter Seven (Red Book); Section Twenty-Four A; Paragraphs (4) and (5) (Gray Book), formerly Paragraphs 5 and 6 of Section Forty-Five; Paragraphs (1), (4), and (10) of Section Forty-Six, and Section Fifty-Three of Chapter Thirty; Sections Thirty to Forty-Two, inclusive, of Chapter One Hundred and Forty- Nine. It is acknowledged during the negotiations which resulted in this Agreement, the Association had the unlimited right and opportunity to make demands and proposals with respect to all proper subjects of collective bargaining. Therefore, for the life of this Agreement, this Agreement shall constitute the total Agreement between the parties; and the Association agrees that the Employer shall not be obligated to any additional collective bargaining. No addition to, alteration, modification, practice, or waiver of any term, provision, covenant, or condition or restriction in this Agreement shall be valid, binding, or of any force or effect unless made in writing and executed by the Employer and the Association. Any prior agreements covering employees covered by this Agreement shall be terminated and of no effect, upon the effective date of this Agreement and shall be superseded by this Agreement.