http://www.ibtikar.ac.ma/modules/module_html/mod6_projet/mod6_1256.htm
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http://www.membres.lycos.fr/senmaroc/wataik/hayatm1.htm
http://www.noorqtr.com/showthread.php?t=1163&page=2
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http://mysite.emoe.org/~asb2b/_private/activity.html