How can we create a nested keyword list

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6 
iex> l |> Enum.reverse() |> Enum.reduce([true], fn x, acc -> Keyword.new([{x, acc}]) end)
[a: [b: [c: [d: [e: [f: [true]]]]]]]

# or the short version...
iex> l |> Enum.reverse() |> Enum.reduce([true], &Keyword.new([{&1, &2}]))