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http://pratikpoddarcse.blogspot.in/p/booksstudy-material.html
http://www.math.toronto.edu/oz/turgor/archives.php
http://ww2.codechef.com/
https://www.placementexpress.com/puzzles.php
http://pratikpoddarcse.blogspot.in/p/booksstudy-material.html
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