http://3things.gitbooks.io/77-failed-startup-post-mortems/wi...
And compare that with the linked article:
http://blog.wishberg.com/post/92014031388/the-final-note-tha...
It looks as if the whole post was copied without any commentary at all.
The diffle one is exactly like that, not quite a 'few sentences'.
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We're not affiliated with the book.