A girl sitting on a rock in the middle of a body of water
A girl is on a boat.
A girl cannot be on a boat and on a rock at the same time.
exists e1 x1 x2 x3 x4 x5 x6.(n_middle(x4) & a_topic(x1) & in(e1,x4) & of(x4,x5) & of(x5,x6) & n_water(x6) & n_body(x5) & on(e1,x3) & n_rock(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_girl(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_boat(x2)) & n_girl(x1))