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"the code which I have explained" [DANC]

It's not easy to think like Sherlock Holmes.

You may recall that we interviewed Maria Konnikova, author of the book Mastermind: How to Think Like Sherlock Holmes on Episode 54 (and again for The Confidence Game on Episode 91). It's difficult to train one's mind to undo all of the damage that's been caused by our habits.

Case in point: some Tumblr users (or is that usrs?) had a devil of a time deducing the code on an electronic door system.

Take a look but before you do, see if you can discern the solution to this "pretty little problem." [SCAN]

How did you do?

A tip of the deerstalker to Tom Webster for the discovery.

Image credit: Wikimedia Commons