1 IntroductionNOTE: Instead of using this old PLaneT package, you will probably want to move to the sicp package in the new Racket package system, which is maintained by Jens Axel Søgaard. I have contributed a simple #lang sicp to that package, and do not plan to work further on this PLaneT package. This package implements support in PLT’s DrRacket for Abelson and Sussman’s Structure and Interpret