Riddle for all you electronic gurus

Can you figure it out? I spent a couple of days on it and came up clueless. Its a wonder where they found it, but apparently its pretty famous. Three people cracked it, but it took three years. Lol, just remember, dont think of the obvious!

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Reply to
Chewbacca
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No riddle. Spam.

Bill

Reply to
Bill Jeffrey

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