_:b1 <http://example.org/base#a> <http://example.org/base#b> . <http://example.org/base#c> <http://example.org/base#d> _:b2 . _:b3 <http://example.org/base#a> <http://example.org/base#b> <http://example/graph> . <http://example.org/base#c> <http://example.org/base#d> _:b4 <http://example/graph> .