A beaver on the shore of a stream.
A beaver is on the bank of a stream.
shore of a stream can also be called as  bank of a stream.
exists x1 x2 x3.(n_shore(x2) & a_topic(x1) & on(x1,x2) & of(x2,x3) & n_stream(x3) & n_beaver(x1))
exists p1 x1 x2.(n_bank(x2) & exists x3.(on(x1,x2) & of(x2,x3) & n_stream(x3)) & n_beaver(x1))