Two men are ice fishing.
the boy  was listening to music
Two men cannot also be a boy
exists p1 x1.(exists x2 x3.((x1 = x2) & n_fishing(x2) & of(x2,x3) & n_ice(x3)) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_boy(x1) & to(e1,x2) & n_music(x2) & Actor(e1,x1) & v_listen(e1))