A group of bike riders are riding in an athletic event.
Bike riders are at an athletic event.
If the riders are riding in the event, they need to be at the event.
exists e1 s1 x1 x2 x3 x4.(in(e1,x4) & n_event(x4) & a_athletic(s1) & Theme(s1,x4) & Actor(e1,x1) & v_ride(e1) & of(x1,x2) & n_rider(x2) & of(x2,x3) & n_bike(x3) & n_group(x1))
exists p1 x1 x2.(exists s1 x3.(at(x1,x3) & n_event(x3) & a_athletic(s1) & Theme(s1,x3)) & n_rider(x1) & (x1 = x2) & ne_nam_bike(x2))