Two people working on a rock wall.
Two people working on a rock wall in a gym.
Not all rock walls are in a gym.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_wall(x3) & of(x3,x4) & n_rock(x4) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x5) & n_gym(x5) & on(e1,x3) & n_wall(x3) & of(x3,x4) & n_rock(x4) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))