Two adults and two children sit on a park bench.
Two parents and their children are at the park.
Not all adults are parents.
exists e1 x1 x2 x3 x4 x5.(on(e1,x4) & n_bench(x4) & of(x4,x5) & n_park(x5) & Actor(e1,x1) & v_sit(e1) & n_child(x3) & card_eq_2(x3) & n_adult(x2) & subset_of(x3,x1) & subset_of(x2,x1) & card_eq_2(x1))
exists p1 x1 x2 x3 x4.(n_park(x4) & at(x1,x4) & subset_of(x3,x1) & n_child(x3) & of(x3,x2) & n_thing(x2) & subset_of(x2,x1) & n_parent(x2) & card_eq_2(x2))