Donald Knuth 2013-05-24-15.19.53

2013-05-24-15.18.392013-05-24-15.19.452013-05-24-15.19.532013-05-24-15.26.092013-05-24-15.26.312013-05-24-15.32.552013-05-24-15.33.24
2013-05-24-15.19.53

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