A group of cyclists are racing in a velodrome.
people on bikes
A cyclist is a person riding a bicycle. A bike is a synonym of bicycle. The plural of "person" is "people." A group of cyclists are therefore people riding bikes.
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 x1 x2.(a_topic(x1) & on(x1,x2) & n_bike(x2) & n_people(x1))