BMXer in the air with motion blur on the forest background.
There is no BMXer in the forest.
A bmxer is in the forest you cannot say there is non in the forest.
exists s1 x1 x2 x3 x4 x5.(n_background(x4) & of(x4,x5) & n_forest(x5) & n_air(x1) & ne_org_bmxer(s1) & a_topic(s1) & in(s1,x1) & on(x1,x4) & with(x1,x2) & n_blur(x2) & of(x2,x3) & n_motion(x3))
exists p1 x1 x3.(n_forest(x3) & -exists x2.((x1 = x2) & in(x2,x3) & n_bmxer(x2)))