A clear, multilayer polymeric film that is desirable for thermoforming applications. More specifically, this invention relates to production of methyl methacrylate, an ester, by reaction of methyl propionate with formaldehyde, in presence of a basic catalyst, for example, cesium acetate on silica. Of the instructions executed, at least some of the instructions are decoded and the inputs of each decoded instruction determined. The threads are frusto-conical, non-symmetrical threads with a differential diametral taper.