_:e0 <http://example.org/vocab#p> _:e1 .
_:e1 <http://example.org/vocab#p> _:e2 .
_:e2 <http://example.org/vocab#z> "bar1" .
_:e2 <http://example.org/vocab#z> "bar2" .
_:e3 <http://example.org/vocab#p> _:e4 .
_:e4 <http://example.org/vocab#p> _:e5 .
_:e5 <http://example.org/vocab#z> "foo1" .
_:e5 <http://example.org/vocab#z> "foo2" .