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<http://example.org/ex1#foo-bar> <http://example.org/ex1#foo_bar> "a" .
<http://example.org/ex2#foo-bar> <http://example.org/ex2#foo_bar> "b" .
<http://example.org/ex3#foo-bar> <http://example.org/ex3#foo_bar> "c" .
<http://example.org/ex4#foo-bar> <http://example.org/ex4#foo_bar> "d" .