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EXHIBIT 10.14 AMENDMENT NO.4 AMENDMENT NO. 4 dated as of September 26, 2001 (this AMENDMENT NO. 4) between: HOLLY CORPORATION, NAVAJO REFINING COMPANY, BLACK EAGLE, INC., NAVAJO CORP., NAVAJO SOUTHERN, INC., NAVAJO NORTHERN. INC. LOREFCO, INC., NAVAJO...