A BMX biker in a white and blue helmet rides in front of some blue and black boxes.
Someone is in a bike race.
Not all bike riding takes place during a race.
exists s1 s2 s3 s4 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x3) & in(x3,x5) & of(x5,x6) & n_box(x6) & a_black(s4) & Theme(s4,x6) & a_blue(s3) & Theme(s3,x6) & n_front(x5) & n_ride(x3) & of(x3,x4) & n_helmet(x4) & a_blue(s2) & Theme(s2,x3) & a_white(s1) & Theme(s1,x3) & n_biker(x1) & (x1 = x2) & ne_org_bmx(x2))
exists p1 x1.(exists x2 x3.(in(x1,x2) & n_race(x2) & of(x2,x3) & n_bike(x3)) & n_person(x1))