Two guys are sharing headphones and are listening to music on a subway.
Two men are napping on the subway seats.
Sharing headphones is not required while napping
exists e1 e2 x1 x2 x3 x4 x5.(on(e2,x5) & n_subway(x5) & to(e2,x4) & n_music(x4) & Actor(e2,x3) & v_listen(e2) & n_guy(x3) & card_eq_2(x3) & Theme(e1,x2) & Actor(e1,x1) & v_share(e1) & n_headphone(x2) & n_guy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_seat(x2) & of(x2,x3) & n_subway(x3) & on(e1,x2) & Actor(e1,x1) & v_nap(e1) & n_man(x1) & card_eq_2(x1))