Two people in racing clothes and helmets are riding motorcycles.
The people riding motorcycles are competing in a race.
Two people in racing clothes and helmets are riding motorcycles does not mean they are competing in a race
exists e1 e2 x1 x2 x3 x4 x5 x6.(Theme(e2,x6) & Actor(e2,x1) & v_ride(e2) & n_motorcycle(x6) & Theme(e1,x3) & Actor(e1,x2) & v_race(e1) & subset_of(x5,x3) & n_helmet(x5) & subset_of(x4,x3) & n_clothes(x4) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 e2 x1 x2 x3 x4.(n_people(x1) & in(e2,x4) & n_race(x4) & Actor(e2,x1) & v_compete(e2) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_motorcycle(x3) & (x1 = x2))