Motorcyclists racing on a track.
Bicyclists are competing in the tour de france race.
Motorcyclists  and  bicyclist are different kinds of riders.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_track(x3) & Actor(e1,x2) & v_race(e1) & (x1 = x2) & n_motorcyclist(x1))
exists e1 s1 x1 x2 x3 x4.(n_race(x2) & of(x2,x4) & n_france(x4) & a_de(s1) & Theme(s1,x2) & of(x2,x3) & n_tour(x3) & in(e1,x2) & Actor(e1,x1) & v_compete(e1) & n_bicyclist(x1))