One boy in a striped shirt and one girl in a green shirt each riding on bicycles with training wheels.
A boy and a girl are riding bikes.
Riding bikes is rephrasing of riding on bicycles.
exists s1 x1 x2 x3 x4.(all x5.(n_riding(x5) -> exists s2 x6 x7 x8 x9.(a_topic(x1) & in(x1,x2) & in(x2,x6) & on(x6,x7) & with(x7,x8) & n_wheel(x8) & of(x8,x9) & n_training(x9) & n_bicycle(x7) & for(x6,x5) & n_shirt(x6) & a_green(s2) & Theme(s2,x6))) & n_girl(x4) & card_eq_1(x4) & n_shirt(x3) & subset_of(x4,x2) & subset_of(x3,x2) & a_striped(s1) & Theme(s1,x2) & n_boy(x1) & card_eq_1(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & n_bike(x4) & subset_of(x3,x1) & n_girl(x3) & subset_of(x2,x1) & n_boy(x2))