EXHIBIT A JOINT FILING AGREEMENT The undersigned and each other person executing this joint filing agreement (this "Agreement") agree as follows: The undersigned and each other person executing this Agreement are responsible for the timely filing of...

                                                                       EXHIBIT A

                             JOINT FILING AGREEMENT

         The undersigned and each other person executing this joint filing
agreement (this "Agreement") agree as follows:

         The undersigned and each other person executing this Agreement are
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 the undersigned or any other person
executing this Agreement is responsible for the completeness or accuracy of the
information statement concerning any other persons making the filing, unless
such person knows or 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.

Date:  April 13, 2001



                                            U-C HOLDINGS, L.L.C.
                                                 
                                            By:      Xxxxxx Xxxxx & Partners, L.P.
                                                     Its Managing Member

                                            By:      Xxxxxx Xxxxx & Partners, L.L.C.
                                                     Its General Partner

                                            By:      /s/ XXXXXX X. XXXX
                                                     -------------------------------------------
                                                     Xxxxxx X. Xxxx
                                                     Its: Managing Director

                                            XXXX X. XXXXXX

                                            By:      /s/ XXXXXX X. XXXX
                                                     -------------------------------------------
                                                     Xxxxxx X. Xxxx, pursuant to a Power
                                                     of Attorney filed with the Commission

                                            AVY X. XXXXX

                                            By:      /s/ XXXXXX X. XXXX
                                                     -------------------------------------------
                                                     Xxxxxx X. Xxxx, pursuant to a Power
                                                     of Attorney filed with the Commission

                                            XXXXXX X. XXXXXXXXXX

                                            By:      /s/ XXXXXX X. XXXX
                                                     -------------------------------------------
                                                     Xxxxxx X. Xxxx, pursuant to a Power
                                                     of Attorney filed with the Commission

                                            XXXXXX X. XXXX

                                                     /s/ XXXXXX X. XXXX
                                            --------------------------------------------------