Update 2020-04-27-ecoop20.md

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Name Stage Failure
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  *  External link http://web.stanford.edu/dept/news/pr/01/floydobit117.html failed: 404 No error
* External link http://www.cis.upenn.edu/~hol/sunrise/ failed: 404 No error
* External link https://www.doc.ic.ac.uk/~pg/papers/mfps15.pdf failed: 404 No error
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