A group of cyclists are racing in a velodrome.
people racing for prize
You can not infer it is for a prize.
exists e1 x1 x2 x3.(in(e1,x3) & n_velodrome(x3) & Actor(e1,x1) & v_race(e1) & of(x1,x2) & n_cyclist(x2) & n_group(x1))
exists e1 x1 x2 x3.(a_topic(x1) & for(e1,x3) & n_prize(x3) & Actor(e1,x2) & v_race(e1) & (x1 = x2) & n_people(x1))