Bikers race through a forest.
A fitness group of bikers are riding through a forest
Bikers can be casual or fitness.
exists x1 x2 x3.(a_topic(x1) & through(x1,x3) & n_forest(x3) & n_race(x1) & of(x1,x2) & n_biker(x2))
exists e1 x1 x2 x3 x4.(through(e1,x4) & n_forest(x4) & Actor(e1,x1) & v_ride(e1) & of(x1,x3) & n_biker(x3) & n_group(x1) & of(x1,x2) & n_fitness(x2))