Two children on one swing at a park with other children.
Children playing at a park, waiting for the ice cream truck.
Just because children are at a park does not mean they are waiting for an ice cream truck.
exists x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & at(x2,x3) & with(x3,x4) & -(x4 = x1) & n_child(x1) & n_child(x1) & n_child(x4) & n_park(x3) & n_swing(x2) & card_eq_1(x2) & card_eq_2(x1))
exists e2 e1 x1 x2 x3 x4 x5 x6.(n_truck(x4) & of(x4,x6) & n_cream(x6) & of(x4,x5) & n_ice(x5) & for(e2,x4) & Actor(e2,x3) & v_wait(e2) & n_child(x3) & at(e1,x2) & n_park(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))