1. 6.DATA STRUCTURES
   1. 6.1Scheme Lists
   2. 6.2Abstract Data Structures
   3. 6.3Stack Data Structure
   4. 6.4Queue Data Structure
   5. 6.5Object Programming
      1. 6.5.1Preliminary Definitions
      2. 6.5.2A Trivial Object
      3. 6.5.3More Definitions
      4. 6.5.4Stack Objects
      5. 6.5.5Queue Objects
   6. 6.6Scheme Lists as a Primitive Data Structure
      1. 6.6.1A Simple List Application
   7. 6.7Arrays