EXHIBIT 4 MEMORANDUM OF UNDERSTANDING This MEMORANDUM OF UNDERSTANDING, dated as of May 25, 2007 (this "MOU") is made by and between (1) Portfolio Logic LLC, a Delaware limited liability company ("Portfolio Logic"), and (2) The D3 Family Fund, L.P.,...Memorandum of Understanding • May 29th, 2007 • Nierenberg Investment Management Co • Services-home health care services
