A woman on a computer at a desk.
Woman reading a book
One can't be reading and on a computer.
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & at(x2,x3) & n_desk(x3) & n_computer(x2) & n_woman(x1))
exists e1 x1 x2.(ne_nam_woman(x1) & Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_book(x2))