6.1 Equivalence 6.2 Numbers 6.3 Booleans 6.4 Pairs and Lists 6.5 Symbols 6.6 Keywords 6.7 Identifiers 6.8 Characters 6.9 Character Set 6.10 Strings 6.11 Regular expression 6.12 Vectors 6.13 Hashtables 6.14 Weak pointers 6.15 Control features 6.16 Exceptions 6.17 Eval and repl 6.18 Input and Output 6.19 Loading Programs 6.20 Comparison and sorting 6.21 System interface