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(discuss.tchncs.de)
~~sauce~~ source
Maybe to avoid all the page numbering after that being shifted?
Maybe a play on "This page intentionally left blank" from the IBM manuals
This is in no way unique to IBM manuals.
The phrase is present in loads of books and in some cases has been for quite a few years.
https://meh.com/forum/topics/nothing-is-lacking-the-long-history-of-intentionally-blank-pages
https://www.google.com/search?q=%22this+page+intentionally+left+blank&udm=36
That would make sense. It's a playful book with many jokes in it
It's the very first page and the second one is page 2
So then it would affect literally all the pages in the book, if it were removed!?!:-P
Well, it's not uncommon to leave the first page blank or with some generic stuff. Someone else already pointed out that it might be an inside joke