A motocross rider is on a dirt hill.
The rider is outside on a dirt hill.
A motorcross rider is a rider.
exists p1 x1 x2.(exists x3 x4.(on(x1,x3) & n_hill(x3) & of(x3,x4) & n_dirt(x4)) & n_rider(x1) & of(x1,x2) & n_motocross(x2))
exists s1 x1 x2 x3.(n_rider(x1) & on(s1,x2) & n_hill(x2) & of(x2,x3) & n_dirt(x3) & Theme(s1,x1) & a_outside(s1))