Two climbers climbing a steep mountain face.
Two climbers are walking in a desert.
Walking and climbing are different.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_climb(e1) & n_face(x3) & of(x3,x4) & n_mountain(x4) & a_steep(s1) & Theme(s1,x3) & (x1 = x2) & n_climber(x1) & card_eq_2(x1))
exists e1 x1 x2.(in(e1,x2) & n_desert(x2) & Actor(e1,x1) & v_walk(e1) & n_climber(x1) & card_eq_2(x1))