Four dirt bike riders are riding on a dirt road.
The riders are under water.
There cannot be a dirt road under water.
exists e1 x1 x2 x3 x4 x5.(on(e1,x4) & n_road(x4) & of(x4,x5) & n_dirt(x5) & Actor(e1,x1) & v_ride(e1) & n_rider(x1) & of(x1,x3) & n_bike(x3) & of(x1,x2) & n_dirt(x2) & card_eq_4(x1))
exists p1 x1.(n_rider(x1) & exists x2.(under(x1,x2) & n_water(x2)))