Dirt bikes get airborne at a racetrack.
The dirt bikes are all the same color.
Not all dirt bikes are the same color.
exists e1 p1 x1 x2 x3.(at(e1,x3) & n_racetrack(x3) & exists s1.(Theme(s1,x1) & a_airborne(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_bike(x1) & (x1 = x2) & ne_nam_dirt(x2))
exists p1 s1 x1 x2 x4.(n_color(x4) & a_same(s1) & Theme(s1,x4) & n_bike(x1) & of(x1,x2) & n_dirt(x2) & all x3.((x3 = x4) -> (x1 = x3)))