Two climbers climbing a steep mountain face.
Climbers are climbing up the front of the mountain.
They can climb any part not always the front
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 x3.(n_mountain(x3) & n_front(x2) & up(e1,x2) & of(x2,x3) & Actor(e1,x1) & v_climb(e1) & n_climber(x1))