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History for http://boingboing.net/2012/05/23/shadow-qr-codes-that-only-work.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+boingboing%2FiBag+%28Boing+Boing%29
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Shadow QR codes that only work in certain sunlight - Boing Boing
24-05-2012 to
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totpunk
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