Petition by defendants for discretionary review pursuant to G.S. 7A-31 denied 17 December 1992. Motion by NACSA in support of petition for discretionary review denied 17 December 1992. Motion by CAPIA in support of petition for discretionary review denied 17 December 1992. Motion by plaintiffs for extension of time to file response to petition for discretionary review denied 17 December 1992.