Two men playing instruments.
Two people are not holding any instruments.
If someone is not holding any instruments, then they cannot be playing one.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_instrument(x3) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists x1.(-all x2.(n_instrument(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1))) & n_people(x1) & card_eq_2(x1))