A man and woman kiss in a train window.
People kiss on a train.
A man and a woman is a person.
exists x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x4) & n_window(x4) & of(x4,x5) & n_train(x5) & n_kiss(x1) & of(x1,x3) & n_woman(x3) & of(x1,x2) & n_man(x2))
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_train(x3) & n_kiss(x1) & of(x1,x2) & n_people(x2))