Three boys jumping off of a platform.
There are boys sitting on a chair.
one group is jumping while the other group is sitting
exists e1 x1 x2 x3.(a_topic(x1) & of(e1,x3) & n_platform(x3) & r_off(e1) & Actor(e1,x2) & v_jump(e1) & (x1 = x2) & n_boy(x1) & card_eq_3(x1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & on(e1,x4) & n_chair(x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_boy(x2))