[DNG] Historical note on double negation.

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M++\Hendrik Boom
|||Maitor
||MRowland penny
|MAntony Stone
M-\Rick Moen
M.|Hendrik Boom
|.M\Ian Zimmerman
|.|MHendrik Boom
M\|Rick Moen
||MRick Moen
|M|Harald Arnesen
|.MHendrik Boom
MHendrik Boom