Petition by plaintiff for discretionary review pursuant to G.S. 7A-31 and Appellate Rule 16(b) as to issues in addition to those presented as the basis for the dissenting opinion denied 1 July 1993. Motion by defendants to dismiss appeal in part allowed 1 July 1993. Petition by defendants for discretionary review pursuant to G.S. 7A-31 denied 1 July 1993.