e1aa4d2e__A_KLR_Global_Tax_Blog_Article__American_Opportunity_Credit
[0] Number of tax years credit available [Lifetime Learning Credit] Available for an unlimited number of years [American Opportunity Credit] 
Available ONLY for 4 tax years per eligible student (including any year(s) Hope credit was claimed)
Education Tax Credits: A KLR Global Tax Blog Article
American Opportunity Credit