A man stands behind his fish stand waiting for customers.
a man at a fish stand
A man standing behind a fish stand is necessarily a man at a fish stand.
exists e1 e2 x1 x2 x3 x4.(for(e1,e2) & for(e2,x4) & n_customer(x4) & Actor(e2,x1) & v_wait(e2) & behind(e1,x2) & n_stand(x2) & of(x2,x3) & n_fish(x3) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & at(x1,x2) & n_stand(x2) & of(x2,x3) & n_fish(x3) & n_man(x1))