A dirt biker rounding a bend on a downhill course.
A dirt biker is downhill course
There is a dirt baker rounding a horse.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & on(e1,x5) & n_course(x5) & of(x5,x6) & n_downhill(x6) & Theme(e1,x4) & Actor(e1,x3) & v_round(e1) & n_bend(x4) & (x1 = x3) & n_biker(x1) & of(x1,x2) & n_dirt(x2))
exists p1 x1 x2.(exists s1 x3.((x1 = x3) & n_course(x3) & a_downhill(s1) & Theme(s1,x3)) & n_biker(x1) & of(x1,x2) & n_dirt(x2))