Title: Some sofic shifts cannot commute with nonwandering shifts of finite type
Abstract: Suppose S is a nonwandering shift of finite type (SFT), and T is an expansive automorphism of S. We show T cannot be a strictly sofic almost Markov shift.Also included is an example of D. Fiebig, a reducible SFT with an expansive automorphism which is not SFT.