four rockers posing on a tree stump.
Four people are on a tree stump.
Sentence 2 of four people on a tree stump is a rephrasing of four rockers on a tree stump.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_stump(x3) & of(x3,x4) & n_tree(x4) & Actor(e1,x2) & v_pose(e1) & (x1 = x2) & n_rocker(x1) & card_eq_4(x1))
exists p1 x1.(exists x2 x3.(on(x1,x2) & n_stump(x2) & of(x2,x3) & n_tree(x3)) & n_people(x1) & card_eq_4(x1))