Two boys riding tricycles on concrete wearing short-sleeve shirts.
Two boys on blue tricycles are riding on the concrete.
It is not apparent the tricycles are blue.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & on(e1,x4) & Theme(e2,x6) & Actor(e2,x5) & v_wear(e2) & n_shirt(x6) & a_short-sleeve(s1) & Theme(s1,x6) & (x4 = x5) & n_concrete(x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_tricycle(x3) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(n_concrete(x3) & on(e1,x3) & Actor(e1,x1) & v_ride(e1) & on(x1,x2) & n_tricycle(x2) & a_blue(s1) & Theme(s1,x2) & n_boy(x1) & card_eq_2(x1))