A mountain climber hangs from a cliff above the ocean.
Nobody is climbing
If nobody is climbing, the man can't hang from the cliff.
exists e1 x1 x2 x3 x4.(n_ocean(x4) & from(e1,x3) & above(x3,x4) & n_cliff(x3) & Actor(e1,x1) & v_hang(e1) & n_climber(x1) & of(x1,x2) & n_mountain(x2))
-exists e1 x1.(Actor(e1,x1) & v_climb(e1) & n_person(x1))