Three children in a ball pit.
The brothers shriek with joy as they jump up and down among the balls.
Not all children are brothers. The fact that three children in a ball pit doesn't imply that they shriek with joy as they jump up and down among the balls.
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_pit(x2) & of(x2,x3) & n_ball(x3) & n_child(x1) & card_eq_3(x1))
exists e1 p1 x1 x2 x3 x4.(n_ball(x4) & n_thing(x1) & n_ball(x3) & n_brother(x1) & exists e3 e2 s1 s2.(among(e3,x4) & a_down(s2) & Manner(e3,s2) & Actor(e3,x1) & v_jump(e3) & among(e2,x3) & a_up(s1) & Manner(e2,s1) & Actor(e2,x1) & v_jump(e2)) & as(e1,p1) & with(e1,x2) & n_joy(x2) & Actor(e1,x1) & v_shriek(e1))