[plt-scheme] HTDP: 9.5.5

Now discover Jens's hint by following the design recipe.


On Sep 13, 2008, at 7:33 PM, Grant Rettke wrote:

> On Sat, Sep 13, 2008 at 5:57 PM, Jens Axel Soegaard
> <jensaxel at soegaard.net> wrote:
>> Think recursively:
>>
>>  1234 = 4 + 10*123
>
> I see! Thanks Jens.
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