Two girls sit in the grass while a boy kneels on top of a soccer ball.
The boy is sitting on a beach ball.
It either has to be two girls or a boy, but it can't be both at same time.
exists e1 p1 x1 x2.(n_grass(x2) & exists e2 x3 x4 x5 x6.(on(e2,x4) & of(x4,x5) & n_ball(x5) & of(x5,x6) & n_soccer(x6) & n_top(x4) & Actor(e2,x3) & v_kneel(e2) & n_boy(x3)) & while(e1,p1) & in(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_boy(x1) & on(e1,x2) & n_ball(x2) & of(x2,x3) & n_beach(x3) & Actor(e1,x1) & v_sit(e1))