do
let xs : int[,,] = Array3D.init 3 4 5 (fun a b c -> a + b + c)
[0 .. Array3D.length1 xs - 1] |> (List.map (fun i ->
Array2D.init (Array3D.length2 xs) (Array3D.length3 xs) (fun a b -> xs.[i,a,b])))
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