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LaTeX-examples/documents/Programmierparadigmen/scripts/haskell/fibonacci-akk.hs

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fibAkk n n1 n2
| (n == 0) = n1
| (n == 1) = n2
| otherwise = fibAkk (n - 1) n2 (n1 + n2)
fib n = fibAkk n 0 1