<http://example.org/thing> <http://example.org/comment> "Impossible bytes: \uFFFD \uFFFD" .
<http://example.org/thing> <http://example.org/comment> "2 continuation bytes: \uFFFD" .
<http://example.org/thing> <http://example.org/comment> "Missing continuation: \uFFFD" .
<http://example.org/thing> <http://example.org/comment> "Impossible bytes: \uFFFD \uFFFD" .
<http://example.org/thing> <http://example.org/comment> "2 continuation bytes: \uFFFD" .
<http://example.org/thing> <http://example.org/comment> "Missing continuation: \uFFFD" .