An airline runway vehicle pulls a cargo cart.
The runway is empty
It cannot be empty if there is a runway vehicle.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_pull(e1) & n_cart(x4) & of(x4,x5) & n_cargo(x5) & n_vehicle(x1) & of(x1,x3) & n_runway(x3) & of(x1,x2) & n_airline(x2))
exists s1 x1.(n_runway(x1) & Theme(s1,x1) & a_empty(s1))