A climber hangs from a rock face while another watches.
Two climbers talk about their problems on a subway.
a climber is not two climbers
exists e1 x1 x2 x3 x4 x5.(n_watch(x4) & while(e1,x5) & n_watch(x5) & -(x5 = x4) & from(e1,x2) & n_face(x2) & of(x2,x3) & n_rock(x3) & Actor(e1,x1) & v_hang(e1) & n_climber(x1))
exists e1 x1 x2 x3.(about(e1,x2) & on(x2,x3) & n_subway(x3) & n_problem(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_talk(e1) & n_climber(x1) & card_eq_2(x1))