Birds flocking by the water's edge.
A flock of seagulls hunt for food.
The word seagulls isn't used in the first sentence to describe the birds. We also now know that they are hunting for food.
exists e1 x1 x2 x3 x4.(n_edge(x4) & of(x4,x3) & n_water(x3) & a_topic(x1) & by(e1,x4) & Actor(e1,x2) & v_flock(e1) & (x1 = x2) & n_bird(x1))
exists x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & for(x2,x4) & n_food(x4) & n_hunt(x2) & of(x2,x3) & n_seagull(x3) & n_flock(x1))