Two people signing books.
Some people are sitting on a ski lift.
The people must be either signing books or sitting on a lift.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_sign(e1) & n_book(x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(on(e1,x2) & n_lift(x2) & of(x2,x3) & n_ski(x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1))