from SC 13D
1 page
<page> 1 Exhibit 1 Cusip No. 67612w108 Agreement Concerning Joint Filing of Schedule 13d the Undersigned Agree as Follows: (I) Each of Them Is Individually Eligible to Use the Schedule 13d to Which This Exhibit Is Attached, and Such Schedule 13d Is Filed on Behalf of Each of Them; and (II) Each of Them Is Responsible for the Timely Filing of Such Schedule 13d and Any Amendments Thereto, and for the Completeness and Accuracy of the Information Concerning Such Person Contained Therein; but None of Them Is Responsible for the Completeness or Accuracy of the Information Concerning the Other Person Making the Filing, Unless Such Person Knows of Has Reason to Believe That Such Information Is Inaccurate. This Agreement May Be Executed in Any Number of Counterparts, Each of Which Shall Be Deemed to Be an Original, but All of Which, Taken Together, Shall Constitute One and the Same Instrument. Dated June 27, 2001 <page> 2 V. Prem Watsa /S/ V. Prem Watsa the Sixty Two Investment Company Limited By: /S/ V. Prem Watsa Name: V. Prem Watsa Title: President Fairfax Financial Holdings Limited By: /S/ V. Prem Watsa Name: Eric P. Salsberg Title: Vice President, Corporate Affairs Odyssey Re Holdings Ltd. By: /S/ Eric P. Salsberg Name: Eric P. Salsberg Title: Vice President Odyssey Re Group Ltd. By: /S/ Eric P. Salsberg Name: Eric P. Salsberg Title: Vice President <page> 3 Fairfax Inc. By: /S/ Donald L. Smith Name: Donald L. Smith Title: Vice President Tig Holdings, Inc. By: /S/ William H. Huff Name: William H. Huff Title: Senior Vice President Tig Insurance Group By: /S/ William H. Huff Name: William H. Huff Title: Vice President Tig Insurance Company By: /S/ William H. Huff Name: William H. Huff Title: Vice President Orh Holdings Inc. By: /S/ Donald L. Smith Name: Donald L. Smith Title: Senior Vice President
