On Wed, Sep 2, 2015 at 3:17 PM, Mike Day <[email protected]> wrote:
> nicely concise.  I feel there's a closed form hiding in there
> somewhere, to replace the explicit loop,  but haven't found
> it yet!

baksub looks like it could be done using u/\. but forsub would have to
be some sort of u/&|.\ expression.

-- 
Raul
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