a group of people walking down the street.
Friends out for a walk.
A group of people don't have to be friends.
exists e1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & of(x1,x2) & down(e1,x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists x1 x2 x3.(a_topic(x1) & for(x2,x3) & n_walk(x3) & out(x1,x2) & n_thing(x2) & n_friend(x1))