Two people on bicycles, one is wearing white and black and the other is wearing blue and red.
Two bicycle riders are racing.
Sitting on bicycle does not mean that they are racing
exists e2 e1 p1 p2 x1 x2 x3 x4.(n_other(x4) & exists s3 s4.(Theme(s4,x4) & a_red(s4) & Theme(s3,x4) & a_blue(s3)) & Topic(e2,p2) & Actor(e2,x4) & v_wear(e2) & rel(e1,x2) & on(x2,x3) & n_bicycle(x3) & n_people(x2) & card_eq_2(x2) & exists s1 s2.(Theme(s2,x1) & a_black(s2) & Theme(s1,x1) & a_white(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_wear(e1) & n_thing(x1) & card_eq_1(x1))
exists e1 x1 x2.(Actor(e1,x1) & v_race(e1) & n_rider(x1) & of(x1,x2) & n_bicycle(x2) & card_eq_2(x1))