Common use of Xxxx Clause in Contracts

Xxxx. Xx. Xxxx xxx been a Director of Pioneer USA since August 1997 and the Executive Vice President -- Business Development of Pioneer USA since August 1997. He served as a Director of Parkxx & Xarsley Petroleum USA, Inc. from June 1997 until August 1997. He was a Senior Vice President of Parker & Parsxxx Xxxroleum USA, Inc. from October 1996 until August 1997. He was a Vice President of Parker & Parsley Petroleum USA, Inc. from December 1995 until October 1996.

Xxxx. Xx. Xxxx xxx been a Director of Pioneer USA since August 1997 and the Executive Vice President -- Business Development of Pioneer USA since August 1997. He served as a Director of Parkxx Parker & Xarsley Parsley Petroleum USA, Inc. from June 1997 until August 1997. He was a Senior Vice President of Parker & Parsxxx Xxxroleum USA, Inc. from October 1996 until August 1997. He was a Vice President of Parker & Parsley Petroleum USA, Inc. from December 1995 until October 1996.