A black-haired swimmer in a pool.
A swimmer in a pool
The swimmer is in a pool in both.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_pool(x2) & n_swimmer(x1) & a_black-haired(s1) & Theme(s1,x1))
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_pool(x2) & n_swimmer(x1))