[plt-scheme] Another request for help with book (HTDP)

It is me again. 

Send details to my mailbox. 

======= 2004-07-07 08:31:25 Matt H：=======

>  For list-related administrative tasks:
>  http://list.cs.brown.edu/mailman/listinfo/plt-scheme
>
>Once again, I appear to be stuck. If someone is willing to help me
>with execise 11.2.2, I would be grateful.
>
>Thanks.
>

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Zhu Chongkai
http://www.websamba.com/mrmathematica