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EXHIBIT 10.22 AMENDMENT NO. 6 AMENDMENT NO. 6 dated as of August 8, 2002 (this AMENDMENT NO. 6) between: HOLLY CORPORATION, NAVAJO REFINING COMPANY, L.P., BLACK EAGLE, INC., NAVAJO SOUTHERN, INC., NAVAJO NORTHERN, INC., LOREFCO, INC., NAVAJO CRUDE OIL...