Three women and a man are lying on the grass.
There are four people.
Three women and a man refers to four people.
exists e1 x1 x2 x3 x4.(n_grass(x4) & on(e1,x4) & Actor(e1,x1) & v_lie(e1) & subset_of(x3,x1) & n_man(x3) & subset_of(x2,x1) & n_woman(x2) & card_eq_3(x2))
exists p1 x1 x2.((x1 = x2) & n_people(x2) & card_eq_4(x2))