People are walking through a shopping center.
The walkers are in a mall.
A mall is a shopping center.
exists e1 x1 x2 x3.(through(e1,x2) & n_center(x2) & of(x2,x3) & n_shopping(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists p1 x1.(n_walker(x1) & exists x2.(in(x1,x2) & n_mall(x2)))