Two young boys in sports t-shirts are walking in a crowd.
Two boys in t-shirts are riding bicycles  in a crowd.
Two boys are walking and two boys are riding bicycles, all are in a crowd.
exists e1 s1 x1 x2 x3 x4.(in(e1,x4) & n_crowd(x4) & Actor(e1,x1) & v_walk(e1) & in(x1,x2) & n_t-shirt(x2) & of(x2,x3) & n_sport(x3) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_crowd(x4) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x3) & in(x1,x2) & n_t-shirt(x2) & n_boy(x1) & card_eq_2(x1))