Two males and one female walking on a path.
Three people get some fresh air and exercize.
Two plus one is three. Males and female are all people so there are three people. Walking is a kind of exercize and path is usually outdoors so they are getting fresh air.
exists s1 s2 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & on(x2,x3) & n_path(x3) & n_walking(x2) & a_female(s2) & Theme(s2,x2) & card_eq_1(x2) & subset_of(x1,s1) & n_male(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_get(e1) & subset_of(x4,x2) & n_exercize(x4) & subset_of(x3,x2) & n_air(x3) & a_fresh(s1) & Theme(s1,x3) & n_people(x1) & card_eq_3(x1))