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let rec reverseK (x:int list) (k:int):int list=
let rec reverseKAux (x:int list) (acc:int list list) (i:int)=
match x with
| [] -> acc
| xhd::xtl when k=i ->
reverseKAux (xhd::xtl) ([]::acc) 0
| xhd::xtl ->
match acc with
| h::t -> reverseKAux xtl ((xhd::h)::t) (i+1)
| [] -> reverseKAux xtl ([xhd]::[]) (i+1)
reverseKAux x [[]] 0
|> List.rev
|> List.collect (fun x -> x)
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