A man grasps onto the rock face.
There is a woman standing.
The person cannot be a man and a woman at the same time
exists e1 x1 x2 x3.(n_face(x2) & of(x2,x3) & n_rock(x3) & onto(e1,x2) & Actor(e1,x1) & v_grasp(e1) & n_man(x1))
exists p1 x1 x2 x3.((x1 = x2) & n_standing(x2) & of(x2,x3) & n_woman(x3))