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Produce the combinations from two lists
Given two lists, produce the list of tuples formed by taking the combinations from the individual lists. E.g. given the letters 
fsharp
fsharp
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["a", "b", "c"] and the numbers [4, 5], produce the list: [["a", 4], ["b", 4], ["c", 4], ["a", 5], ["b", 5], ["c", 5]]
let combinations = (List.fold_left (fun acc number -> acc @ (List.map (fun letter -> (letter, number)) letters)) [] numbers)
let combinations aa bb =
aa
|> List.map (fun a -> bb |> List.map (fun b -> (a, b)))
|> List.concat
aa
|> List.map (fun a -> bb |> List.map (fun b -> (a, b)))
|> List.concat
Submit a new solution for fsharp
There are 24 other solutions in additional languages (clojure, cpp, csharp, erlang ...)
