Two people in racing clothes and helmets are riding motorcycles.
The motorcycles are red and black.
Not every motorcycle is red and black.
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 s1 s2 x1.(n_motorcycle(x1) & Theme(s2,x1) & a_black(s2) & Theme(s1,x1) & a_red(s1))