_:node1 <http://example.org/#p> <http://example.org/#q> .
_:node1 <http://example.org/#r> <http://example.org/#s> .
_:node2 <http://example.org/#p> <http://example.org/#q> .
_:node2 <http://example.org/#r> _:node3 .
_:node3 <http://example.org/#s> <http://example.org/#t> .