效绵鼎 Conventions ■ a,b,..are input symbols. ...,X,Y,Z are tape symbols ...w,X,y,z are strings of input symbols. ,阝，.are strings of tape symbols. .6Conventions ◼ a, b, … are input symbols. ◼ …, X, Y, Z are tape symbols. ◼ …, w, x, y, z are strings of input symbols. ◼ , ,… are strings of tape symbols. 6