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{Google penguin updates}

1. Penguin first              :   April 24 2012
2. Penguin Sec              :   May  26 2014
3. Penguin Third            :  October 5 2014
4. Penguin Fourth          :  May 22 2014
5. Penguin Five              : October 4 2013

(what Is This Google Penguin) 
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