_:b0 <http://example.org/vocab#p> _:b1 .
_:b1 <http://example.org/vocab#p> _:b2 .
_:b2 <http://example.org/vocab#z> "foo1" .
_:b2 <http://example.org/vocab#z> "foo2" .
_:b3 <http://example.org/vocab#p> _:b4 .
_:b4 <http://example.org/vocab#p> _:b5 .
_:b5 <http://example.org/vocab#z> "bar1" .
_:b5 <http://example.org/vocab#z> "bar2" .