Many people on a train hold onto handles.
People standing on top of a train.
handles will not be there on top of train
exists x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & onto(x2,x4) & n_handle(x4) & n_hold(x2) & of(x2,x3) & n_train(x3) & n_people(x1) & n_quantity(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & of(x3,x4) & n_train(x4) & n_top(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1))