A woman is performing the backstroke in a pool.
A human performing
A woman is a human too.
exists e1 x1 x2 x3.(n_backstroke(x2) & in(e1,x3) & n_pool(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_woman(x1))
exists s1 x1.(a_topic(x1) & n_perform(x1) & a_human(s1) & Theme(s1,x1))