Two people are climbing and outdoor artificial climbing wall.
The two people are not on the ground.
The people are climbing so they must not be on the ground.
exists e1 e2 s1 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_climb(e2) & n_wall(x3) & Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_artificial(x2) & a_outdoor(s1) & Theme(s1,x2) & n_people(x1) & card_eq_2(x1))
exists x1 x2.(n_ground(x2) & n_people(x1) & card_eq_2(x1) & -exists p1.on(x1,x2))