A person hanging off of a cliff.
Someone is hanging from their arms.
A person is someone.  From their arms describes how the person is hanging off a cliff.
exists e1 x1 x2 x3.(a_topic(x1) & of(e1,x3) & n_cliff(x3) & r_off(e1) & Actor(e1,x2) & v_hang(e1) & (x1 = x2) & n_person(x1))
exists e1 x1 x2.(from(e1,x2) & n_arm(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_hang(e1) & n_person(x1))