A restaurant worker is cleaning a seat.
A man robbing a restaurant.
cleaning is contradictory to robbing.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_clean(e1) & n_seat(x3) & n_worker(x1) & of(x1,x2) & n_restaurant(x2))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_rob(e1) & n_restaurant(x3) & (x1 = x2) & n_man(x1))