A bicyclist racing in a bike race.
A car driving down the road.
One cannot do bicyclist racing and car driving simultaneously.
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x3) & n_race(x3) & of(x3,x4) & n_bike(x4) & n_racing(x1) & of(x1,x2) & n_bicyclist(x2))
exists e1 x1 x2 x3.(n_road(x3) & a_topic(x1) & down(e1,x3) & Actor(e1,x2) & v_drive(e1) & (x1 = x2) & n_car(x1))