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This is the first paragraph. It [has][link_0] [lots][link_1] [of][link_2]
[links][link_3].

This is the second paragraph. It has sample code that should not be extracted:

    [fakelink]: www.invalid.com

And here are the real links:

[link_0]: www.example.com/0
 [link_1]: www.example.com/1
  [link_2]: www.example.com/2
   [link_3]: www.example.com/3