Many people are running in a race.
Nobody is competing.
Either many people are running in the race competition or nobody is.
exists e1 x1 x2.(in(e1,x2) & n_race(x2) & Actor(e1,x1) & v_run(e1) & n_people(x1) & n_quantity(x1))
-exists e1 x1.(Actor(e1,x1) & v_compete(e1) & n_person(x1))