A rider on a dirt bike is doing a maneuver in midair over a dirt mound.
The rider is on ice.
The rider cannot be over a dirt mound and on ice simultaneously.
exists e1 x1 x2 x3 x4 x5 x6 x7.(over(e1,x6) & n_mound(x6) & of(x6,x7) & n_dirt(x7) & Theme(e1,x4) & Actor(e1,x1) & v_do(e1) & in(x4,x5) & n_midair(x5) & n_maneuver(x4) & on(x1,x2) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & n_rider(x1))
exists p1 x1.(n_rider(x1) & exists x2.(on(x1,x2) & n_ice(x2)))