Added cls_union and cls_intersection to the lexer toxens
Added cls_union and cls_intersection to the lexer toxens

NighatYasmin/RESOLVE,mikekab/RESOLVE,yushan87/RESOLVE,NighatYasmin/RESOLVE,ClemsonRSRG/RESOLVE,mikekab/RESOLVE,yushan87/RESOLVE,ClemsonRSRG/RESOLVE,yushan87/RESOLVE,NighatYasmin/RESOLVE,ClemsonRSRG/RESOLVE