Two people signing books.
The people are famous.
Two people signing books does not indicate that they are famous
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 s1 x1.(n_people(x1) & Theme(s1,x1) & a_famous(s1))