A group of friends posing by a guard rail.
people near a metal fence
A group of friends are people.  A metal fence is a guard rail.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & by(e1,x4) & n_rail(x4) & of(x4,x5) & n_guard(x5) & Actor(e1,x3) & v_pose(e1) & (x1 = x3) & of(x1,x2) & n_friend(x2) & n_group(x1))
exists x1 x2 x3.(a_topic(x1) & near(x1,x2) & n_fence(x2) & of(x2,x3) & n_metal(x3) & n_people(x1))