This Agreement may not be modified in any manner or terminated except by an instrument in writing executed by the parties hereto. If any term, covenant or condition of this Agreement is held to be invalid, illegal or unenforceable in any respect, this Agreement shall be construed without such provision. This Agreement may be executed in any number of duplicate originals and each duplicate original shall be deemed to be an original. This Agreement may be executed in several counterparts, each of which counterparts shall be deemed an original instrument and all of which together shall constitute a single Agreement. The failure of any party hereto to execute this Agreement, or any counterpart hereof, shall not relieve the other signatories from their obligations hereunder. Whenever the context may require, any pronouns used herein shall include the corresponding masculine, feminine or neuter forms, and the singular form of nouns and pronouns shall include the plural and vice versa.