A boy on a bicycle rides the ledge of water fountain while another boy is in the fountain.
cow in a truck
A boy and a cow are two different individuals
exists e1 p1 x1 x2 x3 x4 x5.(n_ledge(x3) & exists p2 x6.(in(x6,x4) & n_boy(x6) & -(x6 = x1)) & n_fountain(x4) & n_fountain(x4) & n_boy(x1) & n_boy(x1) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & of(x3,x4) & of(x4,x5) & n_water(x5) & on(x1,x2) & n_bicycle(x2))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_truck(x2) & n_cow(x1))