A man and a woman are walking down the sidewalk.
Two people are walking outside.
Two people which are a man and a woman are walking outside.
exists e1 x1 x2 x3 x4.(n_sidewalk(x4) & down(e1,x4) & Actor(e1,x1) & v_walk(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 s1 x1.(a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_walk(e1) & n_people(x1) & card_eq_2(x1))