The non-Defaulting Party may sign a written notice (a "Special Default Notice") which - (aa) specifies the relevant event referred to in paragraph 10(a) which has occurred in relation to the Defaulting Party: (bb) states that the non-Defaulting Patty, having made all practicable efforts to do so, including having attempted to use at least two of the methods specified in subparagraph (bXii), (iii) or (v). has been unable to serve a Default Notice by one of the methods specified in those subparagraphs (or such of those methods as are normally used by the non-Defaulting Party when communicating with the Defaulting Party); (cc) specifies the date on which, and the time at which, the Special Default Notice is signed by the non-Defaulting Party; and (dd) states that the event specified in accordance with subparagraph (act) above shall be treated as an Event of Default with effect from the date and time so specified. On the signature of a Special Default Notice the relevant event shall be treated with effect from the date and time so specified as an Event of Default in relation to the Defaulting Party, and accordingly references in paragraph 10 to a Default Notice shall be treated as including a Special Default Notice. A Special Default Notice shall be given to the Defaulting Party as soon as practicable after it is signed. (d) Either party may by notice to the other change the address, telex or facsimile number or electronic messaging system details at which notices or other communications are to be given to it. 15. Entire Agreement; Severability This Agreement shall supersede any existing agreements between the parties containing general terms and conditions for Transactions. Each provision and agreement herein shall be treated as separate from any other provision or agreement herein and shall be enforceable notwithstanding the unenforceability of any such other provision or agreement. 16. Non-assignabllity; Termination (a) Subject to subp