1. http://www.colby.edu/~bknelson/exercises/ojala/index.html
2..http://www.quia.com/cz/9954.html
3.http://www.colby.edu/~bknelson/exercises/subj6_emotion.html
4. http://www.quia.com/cz/63818.html?AP_rand=1454300213
3. http://www.quia.com/pop/111481.html?AP_rand=169837746
4. http://www.quia.com/pop/35713.html
5. http://www.quia.com/cz/97796.html
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