25.1 Nothing Happens25.2 Change to Variable Has No Effect25.3 Change to Function Has No Effect25.4 Values Change "by Themselves"25.5 Built-In Functions Don't Find Elements25.6 Multiple Values Are Lost25.7 Declarations Are Ignored25.8 My Lisp Does the Wrong Thing25.9 How to Find the Function You Want25.10 Syntax of LOOP25.11 Syntax of COND25.12 Syntax of CASE25.13 Syntax of LET and LET*25.14 Problems with Macros25.15 A Style Guide to Lisp25.16 Dealing with Files, Packages, and Systems25.17 Portability Problems25.18 Exercises25.19 Answers