Four boys are sitting on a wall.
the kids sit on the wall
Boys are kids.
exists e1 x1 x2.(on(e1,x2) & n_wall(x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1) & card_eq_4(x1))
exists e1 x1 x2.(n_wall(x2) & n_kid(x1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))