pˈost ðefˈines a sˈimple ˌalɣoɾitmˈiklˈike pɾoθˈess ˈof a mˈan ˌuβe ðˈoβlerˈitiŋ mˈaɾks ˈoɾ eɾˈasiŋ mˈaɾks ˈand ɣˈoɪŋ fɾˈom bˈoks tˈo βˈoks ˈanð ˌeβentwˈaʎi ˈaltiŋ, as ˈe foʎˈows a lˈist ˈof sˈimple instɾˈuktjons.
Post defines a simple algorithmic-like process of a man writing marks or erasing marks and going from box to box and eventually halting, as he follows a list of simple instructions.