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Require Import Crypto.Util.Notations.
Module Option.
Module List.
Section map.
Context {A B}
(f : A -> option B).
Fixpoint map (ls : list A) : list B
:= match ls with
| nil => nil
| cons x xs
=> match f x with
| Some fx => fx :: map xs
| None => map xs
end
end.
End map.
End List.
End Option.
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