http://example.org/a
http://example.org/b
http://example.org/b
http://example.org/a
alan@example.org
http://example.org/b
http://example.org/a
Alan
http://example.org/b
http://example.org/c
alice@example.org
http://example.org/b
http://example.org/c
Alice
http://example.org/b