. "2006-09". . . . . _:wCHNtSIx1643 "Luis_von_ahn". _:wCHNtSIx1643 . . . . . . . . . . _:wCHNtSIx1645. _:wCHNtSIx1642. _:wCHNtSIx1641. _:wCHNtSIx1643. _:wCHNtSIx1644. . . . . . . . . . . "Luis von Ahn"@en. . . . . . . . . . . . . . . . . . "1979". . . . . . "Source: Freebase - The World's database". . . . . . . . _:wCHNtSIx1644 "luis_von_ahn". _:wCHNtSIx1644 . . . . _:wCHNtSIx1642 "Luis_von_Ahn". _:wCHNtSIx1642 . _:wCHNtSIx1641 "5648968". _:wCHNtSIx1641 . _:wCHNtSIx1645 "Von_Ahn". _:wCHNtSIx1645 . . . .