EXPLANATION OF ABBREVIATIONS

Exhibit 4.2

EXHIBIT B

EXPLANATION OF ABBREVIATIONS

     The following abbreviations, when used in the inscription of ownership on the face of this certificate, shall be construed as if they were written out in full according to applicable laws or regulations. Abbreviations, in addition to those appearing below, may be used.

JT TEN		As joint tenants with right of survivorship and		TEN ENT		As tenants by the entireties
		not as tenants in common		UNIF GIFT MIN ACT		Uniform Gifts to Minors Act
TEN COM		As tenants in common		CUST		Custodian for
				UNIF TRANS MIN ACT		Uniform Transfers to Minors Act

THE VOTING RIGHTS AND OBLIGATIONS WITH RESPECT TO, AND SALE OR OTHER DISPOSITION OF, THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE RESTRICTED BY AND SUBJECT TO THE PROVISIONS OF A SECOND AMENDED AND RESTATED STOCKHOLDERS’ AGREEMENT DATED AS OF                                         , 2007, A COPY OF WHICH IS AVAILABLE FOR INSPECTION AT THE OFFICES OF THE COMPANY.

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR ANY STATE SECURITIES LAWS, MAY NOT BE OFFERED, SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF (I) AN EFFECTIVE REGISTRATION STATEMENT FOR THE SECURITIES UNDER SUCH ACT AND ANY APPLICABLE STATE SECURITIES LAW, (II) A “NO ACTION” LETTER OF THE SECURITIES AND EXCHANGE COMMISSION WITH RESPECT TO SUCH SALE OR OFFER, OR (III) AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE COMPANY THAT REGISTRATION UNDER SUCH ACT AND ANY APPLICABLE STATE SECURITIES LAW IS NOT REQUIRED WITH RESPECT TO SUCH SALE OR OFFER.