Three children on a swing set.
Three children outside playing
Not all swing sets are outside, and not everyone plays on swing sets.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & n_set(x2) & of(x2,x3) & n_swing(x3) & n_child(x1) & card_eq_3(x1))
exists s1 x1 x2.(n_playing(x1) & a_outside(s1) & Theme(s1,x1) & of(x1,x2) & n_child(x2) & card_eq_3(x1) & a_topic(x1))