People walking in a supermarket.
People are looking at items
Walking in a supermarket implies that people are looking at items.
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 e1 x1 x2.(at(e1,x2) & n_item(x2) & Actor(e1,x1) & v_look(e1) & n_people(x1))