Two people go dirt bike racing.
Th bikers are riding in a race in the dirt.
" race in the dirt " is a rephrasing of " dirt bike racing "
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_go(e1) & n_racing(x2) & of(x2,x4) & n_bike(x4) & of(x2,x3) & n_dirt(x3) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(n_dirt(x4) & in(e1,x4) & in(e1,x3) & n_race(x3) & Actor(e1,x1) & v_ride(e1) & n_biker(x1) & (x1 = x2) & ne_nam_th(x2))