Riders to 20/20 Schedules

Attached are the inserts to Schedules 3.1(d), (n) and (q) that we discussed.

Please let me know if you have any questions regarding the attached.

Regards,

Rob Taylor
Andrews & Kurth L.L.P.
Chase Tower
600 Travis Street
Suite 4200
Houston, Texas 77002

Tel: (713) 220-4436
Fax: (713) 238-7273

robtaylor@andrews-kurth.com

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- Ridersto.DOC