A man and a woman walking in a field.
Two humans in a field.
A man and a woman are both humans.
exists s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & in(x2,x4) & n_field(x4) & n_walking(x2) & of(x2,x3) & n_woman(x3) & subset_of(x1,s1) & n_man(x1))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_field(x2) & n_human(x1) & card_eq_2(x1))