A man sits on the gravel by an ocean.
A man by a body of water.
Ocean is a type of body of water.
exists e1 x1 x2 x3.(n_gravel(x2) & by(e1,x3) & n_ocean(x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & by(x1,x2) & of(x2,x3) & n_water(x3) & n_body(x2) & n_man(x1))