I got this:
defmodule Fibonacci do
def fib(0), do: 0
def fib(1), do: 1
def fib(n), do: fib(n - 1) + fib(n - 2)
def fib(0), do: 0
def fib(1), do: 1
def fib(n), do: fib(n - 1) + fib(n - 2)
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