An elderly couple walk through an old-looking alley.
A couple of elderly people walking down an alley.
An elderly couple is a rephrasing of a couple of elderly people.
exists s1 s2 x1 x2 x3.(a_topic(x1) & through(x1,x3) & n_alley(x3) & a_old-looking(s2) & Theme(s2,x3) & n_walk(x1) & of(x1,x2) & n_couple(x2) & a_elderly(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & a_down(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_walk(e1) & n_alley(x4) & (x1 = x3) & of(x1,x2) & n_people(x2) & a_elderly(s1) & Theme(s1,x2) & n_couple(x1))