Two young men jump on a bridge.
A stream has no bridge over it.
Either there is a bridge or there is no bridge.
exists e1 s1 x1 x2.(on(e1,x2) & n_bridge(x2) & Actor(e1,x1) & v_jump(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists x1.(-exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & over(x2,x1) & n_bridge(x2)) & n_thing(x1) & n_stream(x1))