EXHIBIT I: Agreement pursuant to Rule 13d-1(f) filed herewith Pursuant to Rule 13d-1(f) of Regulation 13D-G of the General Rules and Regulations of the Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended, the...

       
 EXHIBIT I:     Agreement pursuant to Rule 13d-1(f) filed herewith 
  
  
      Pursuant to Rule 13d-1(f) of Regulation 13D-G of the General Rules and
 Regulations of the Securities and Exchange Commission under the Securities
 Exchange Act of 1934, as amended, the undersigned agree that the statement
 to which this Exhibit is attached is filed on behalf of each of them in the
 capacities set forth below. 
  
                               MAFCO HOLDINGS INC. 
            
                               By:  /s/ Xxxxx X. Xxxxxxxx
                                  --------------------------------
                               Name:  Xxxxx X. Xxxxxxxx 
                               Title: Executive Vice President and 
                                      General Counsel 
  
  
                               PX HOLDING CORPORATION  
  
                               By:  /s/ Xxxxx X. Xxxxxxxx
                                  --------------------------------
                               Name:  Xxxxx X. Xxxxxxxx 
                               Title: Executive Vice President and
                                      General Counsel