[CUSIP No.98426T106 13G Page 2 of 5 Pages -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON: I.R.S. IDENTIFICATION NO. OFOVE PERSON: Morgan Stanley I.R.S. #36-3145972 -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A: (a) [ ] (b) [ ] -------------------------------------------------------------------------------- 3. SEC USE ONLY: -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION: The state of]