There are keys in some kind of box which is open.
The box has keys and is closed
Open is not closed.
exists p1 x1 s1 x2 x3 x4 x5.((x1 = x2) & in(x2,x3) & Theme(s1,x5) & a_open(s1) & (x3 = x5) & of(x3,x4) & n_box(x4) & n_kind(x3) & n_key(x2))
exists e1 s1 x1 x2.(n_box(x1) & Theme(s1,x1) & a_closed(s1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_key(x2))