A person and trainer jumping from an airplane.
The person and trainer are jumping from a cliff.
An airplane is not a cliff.
exists e1 s1 x1 x2 x3 x4.(a_topic(s1) & from(e1,x4) & n_airplane(x4) & Actor(e1,x3) & v_jump(e1) & (s1 = x3) & n_trainer(x2) & n_person(x1) & subset_of(x2,s1) & subset_of(x1,s1))
exists e1 x1 x2 x3 x4.(n_trainer(x3) & n_person(x2) & subset_of(x3,x1) & subset_of(x2,x1) & from(e1,x4) & n_cliff(x4) & Actor(e1,x1) & v_jump(e1))