Two people on dirt bikes jumping dirt ramps with several people in the background.
Two people are riding dirt bikes.
To be on dirt bikes jumping dirt ramps requires riding dirt bikes.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(n_background(x8) & a_topic(x1) & on(x1,x2) & with(e1,x7) & in(x7,x8) & n_people(x7) & a_several(s1) & Theme(s1,x7) & Theme(e1,x5) & Actor(e1,x4) & v_jump(e1) & n_ramp(x5) & of(x5,x6) & n_dirt(x6) & (x2 = x4) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & n_people(x1) & card_eq_2(x1))