a lone climber wearing a white helmet climbing a wall.
A climber is halfway up a mountain.
Climbing a wall doesn't mean he is halfway up a mountain.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_wear(e2) & Theme(e1,x5) & Actor(e1,x4) & v_climb(e1) & n_wall(x5) & (x3 = x4) & n_helmet(x3) & a_white(s2) & Theme(s2,x3) & (x1 = x2) & n_climber(x1) & a_lone(s1) & Theme(s1,x1))
exists p1 x1.(exists x2 x3.((x1 = x2) & up(x2,x3) & n_mountain(x3) & n_halfway(x2)) & n_climber(x1))