EXHIBIT 4 Written Agreement Pursuant to Rule 13d-1(k)(1)(iii) Pursuant to Rule 13d-1(k)(1)(iii) of the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that the preceding Schedule 13D/A of CPH2, LLC, CPH3, LLC, Hadi...

                                    EXHIBIT 4

               Written Agreement Pursuant to Rule 13d-1(k)(1)(iii)

      Pursuant to Rule 13d-1(k)(1)(iii) of the Securities Exchange Act of 1934,
as amended, the undersigned hereby agree that the preceding Schedule 13D/A of
CPH2, LLC, CPH3, LLC, Xxxx Xxxxxxxxxxx, and Xxxxxxx X. Xxxxxxxxxxx is filed with
the Securities and Exchange Commission on behalf of each of them.

                                    CPH2, LLC, a Delaware limited
                                    liability company

                                    By:  /s/ Xxxx Xxxxxxxxxxx
                                        --------------------------
                                          Xxxx Xxxxxxxxxxx, Member

                                    CPH3, LLC, a Delaware limited
                                    liability company

                                    By:  /s/ Xxxx Xxxxxxxxxxx
                                        --------------------------
                                          Xxxx Xxxxxxxxxxx, Member

                                    /s/ Xxxx Xxxxxxxxxxx
                                    ------------------------------
                                    Xxxx Xxxxxxxxxxx


                                    /s/ Xxxxxxx X. Xxxxxxxxxxx
                                    ------------------------------
                                    Xxxxxxx X. Xxxxxxxxxxx