A man on a 4-wheeler is in midair in a dry dusty area.
A man is skydiving.
The man can't be on a 4-wheeler and skydiving at the same time.
exists p1 x1 x2.(exists s1 s2 x3 x4.(in(x1,x3) & in(x3,x4) & n_area(x4) & a_dusty(s2) & Theme(s2,x4) & a_dry(s1) & Theme(s1,x4) & n_midair(x3)) & on(x1,x2) & n_4-wheeler(x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_skydive(e1) & n_man(x1))