[plt-scheme] HtDP -- Looking for gensym function

Hi All --

The gensym function, required for HtDP exercise 32.1.3, isn't
available.

In the past, once group member advised --

You can write a teachpack that provides gensym and add it to your ISL
or ASL program.

The teachpack itself would be written in the module language and look
like:

#lang scheme
(provide gensym)

Save this file somewhere, then go to Language > Add Teachpack ... >
Add Teachpack to List... and select this file. --

I tried this and it didn't work. Any suggestions?

Thanks,
Dave Yrueta