Donald Knuth 2013-05-24-15.26.31

2013-05-24-15.19.532013-05-24-15.26.092013-05-24-15.26.312013-05-24-15.32.552013-05-24-15.33.242013-05-24-15.34.052013-05-24-15.37.23
2013-05-24-15.26.31

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