An elderly man and woman hold hands on the sidewalk.
A couple walking.
A man and woman holding hands is a kind of couple.
exists e1 s1 x1 x2 x3 x4 x5.(n_sidewalk(x5) & on(e1,x5) & Theme(e1,x4) & Actor(e1,x1) & v_hold(e1) & n_hand(x4) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1) & a_elderly(s1) & Theme(s1,x1))
exists x1 x2.(a_topic(x1) & n_walking(x1) & of(x1,x2) & n_couple(x2))