People walking in a supermarket.
People shopping at walmart.
People walking in a supermarket does not indicate they are shopping at walmart
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_supermarket(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_walmart(x3) & n_shopping(x1) & of(x1,x2) & n_people(x2))