A biker rides on a dirt road.
A biker is outside.
to be on a dirt road you must be outside
exists e1 x1 x2 x3.(on(e1,x2) & n_road(x2) & of(x2,x3) & n_dirt(x3) & Actor(e1,x1) & v_ride(e1) & n_biker(x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_biker(x1))