Blond child running in a race.
a man on a motorcycle
It is either a child or a man. They cannot be running in a race, and on a motorcycle at the same time.
exists e1 s1 x1 x2.(in(e1,x2) & n_race(x2) & Actor(e1,x1) & v_run(e1) & n_child(x1) & a_blond(s1) & Theme(s1,x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_motorcycle(x2) & n_man(x1))