Markovian Parallax Denigrate

From the Wikipedia page 
Markovian Parallax Denigrate is a series of unexplained word puzzles posted to Usenet in 1996. The posts are often mentioned in conjunction with other bizarre and/or unsolved internet mysteries, such as Sad Satan, Cicada 3301, the Publius Enigma and Unfavorable Semicircle. Hundreds of messages were posted, and were initially dismissed as spam. It has been referred to as "The Internet’s oldest and weirdest mystery", and "one of the first great puzzles of the internet".
Cryptographers, software developers, and hackers have worked on decoding the puzzles, but have never been successful. In 2016, Susan Lindauer was identified as a possible author of these posts, though she denied being the author, and other possible explanations include an early experimental chat bot or text generator, or a programmer experimenting with Markov chains.
There is various coverage on the internet, eg and the Cipher Mysteries page .
Category:Puzzles