Two people working on a rock wall.
Two people are playing tennis.
working on a rock walls and playing tennis are totally different activities.
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.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_tennis(x2) & n_people(x1) & card_eq_2(x1))