A man and two women are sitting in the grass.
Four people are sitting in the grass.
A man and 2 women equates 3 people sitting in the grass, not 4.
exists e1 x1 x2 x3.(n_grass(x3) & in(e1,x3) & Actor(e1,x1) & v_sit(e1) & n_woman(x1) & card_eq_2(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_4(x1))