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Ok, we'll take out the year until someone can suggest a plausible one. Though perhaps the author was working with obsolete info in 2012?

It's "Notes on (the paper) 'Plan 9 From Bell Labs, 1995', 2012"

The Barney Stinson homage, would put it at 2005 at the earliest (when the show started)

It's earlier than that, 4th edition was released in 2003, and IL and 8½ were removed between 3rd (2000) and 4th edition.

Notes on Plan 9