A group of bicyclists racing.
The bicyclists are not competing.
bicyclists can not be racing when there are not competing.
exists e1 x1 x2 x3.(a_topic(x1) & Actor(e1,x3) & v_race(e1) & (x1 = x3) & of(x1,x2) & n_bicyclist(x2) & n_group(x1))
exists x1.(n_bicyclist(x1) & -exists e1.(Actor(e1,x1) & v_compete(e1)))