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Please have a look on this:-http://share-salesforce.blogspot.in/2013/05/sfdc-data-collections-listsetmap.html
Refer the below links for more information .
http://share-salesforce.blogspot.in/2013/05/sfdc-data-collections-listsetmap.html
http://www.sfdc99.com/2013/09/28/data-collections-lists-sets-and-maps/