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adilakhter/gist:4511771

Last active December 10, 2015 23:48
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let rec zipTwo (x:int list) (y: int list) : ((int*int) list) option =
match x,y with
| ([], []) -> Some []
| (xhd::xtl, yhd::ytl) ->
match zipTwo xtl ytl with
| None -> None
| Some lst -> Some ((xhd,yhd)::lst)
| (_,_) -> None
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