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EXHIBIT 10.13 CONFORMED COPY AMENDMENT NO. 3 AMENDMENT NO. 3 dated as of August 7, 2001 (this AMENDMENT NO. 3) between: HOLLY CORPORATION, NAVAJO REFINING COMPANY, BLACK EAGLE, INC., NAVAJO CORP., NAVAJO SOUTHERN, INC., NAVAJO NORTHERN, INC., LOREFCO,...