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Exhibit 99.2

I, D. Ray Cash, hereby certify pursuant to 18 U.S.C. Section 1350 adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 that, to my knowledge:

/s/  D. RAY CASH      
D. Ray Cash
Chief Financial Officer

The foregoing certifications are being furnished solely pursuant to 18 U.S.C. Section 1350 and are not being filed as part of this report or as a separate disclosure document.