This Pledge Agreement and each Joinder Agreement, together with the Revolving Credit Agreement and other Loan Documents, constitutes and expresses the entire understanding between the parties hereto with respect to the subject matter hereof, and supersedes all prior negotiations, agreements and understandings, inducements, commitments or conditions, express or implied, oral or written, except as herein contained.  The express terms hereof and of the Joinder Agreements control and supersede any course of performance or usage of the trade inconsistent with any of the terms hereof and thereof.  Neither this Pledge Agreement nor any Joinder Agreement nor any portion or provision hereof or thereof may be changed, altered, modified, supplemented, discharged, canceled, terminated, or amended orally or in any manner other than as provided in the Revolving Credit Agreement.