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Elixir Deleting a key

kl = [a: 1, a: 2, b: 3, c: 0]
kl = Keyword.delete_first(kl, :b)
kl = Keyword.delete(kl, :a)

IO.puts(Keyword.get(kl, :a))
IO.puts(Keyword.get(kl, :b))
IO.puts(Keyword.get(kl, :c))

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