A man stands holding a string instrument.
The man is holding a box of books.
A string instrument is different than a box of books
exists e1 e2 x1 x2 x3.(for(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_hold(e2) & n_instrument(x2) & of(x2,x3) & n_string(x3) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & of(x2,x3) & n_book(x3) & n_box(x2))