A man is skiing on the tip of a mountain.
The man is in the ocean.
AN OCEAN IS NOT A MOUNTAIN
exists e1 x1 x2 x3.(n_tip(x2) & on(e1,x2) & of(x2,x3) & n_mountain(x3) & Actor(e1,x1) & v_ski(e1) & n_man(x1))
exists p1 x1 x2.(n_ocean(x2) & n_man(x1) & in(x1,x2))