A variety of people are running in a race.
people running the boston marathon
Not every race is the Boston marathon.
exists e1 x1 x2 x3.(in(e1,x3) & n_race(x3) & Actor(e1,x1) & v_run(e1) & of(x1,x2) & n_people(x2) & n_variety(x1))
exists e1 x1 x2 x3 x4.(n_marathon(x3) & of(x3,x4) & n_boston(x4) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_people(x1))