[plt-scheme] errata HTDP 22.3 code in fig 63

This is a problem in the type-setting software for the on-line  
version. If this is in print, let me know.

On Jul 20, 2006, at 1:19 PM, wooks . wrote:

>
> Shouldn't
>
> number-> string
>
> actually be
>
> number->string
>
>
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