A boy is playing in a room full of balls.
The boy is at an entertainment center for kids.
Not all rooms full of balls are located in entertainment centers, and not all entertainment centers are for kids.
exists e1 s1 x1 x2 x3 x4.(in(e1,x2) & of(s1,x4) & n_ball(x4) & Theme(s1,x3) & a_full(s1) & (x2 = x3) & n_room(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))
exists p1 x1.(n_boy(x1) & exists x2 x3 x4.(at(x1,x2) & for(x2,x4) & n_kid(x4) & n_center(x2) & of(x2,x3) & n_entertainment(x3)))