* http://mshook.appspot.com/z/d4m.htm?/mshook/scheme
* The Ten Commandments
   1. How to recur on a list of atoms, a number and an S-expression | 23 64 83
   2. Cons to build | 37
   3. Typical element, cons & recur | 45
   4. Change >= 1 arg closer to termination & test | 57 65 84
   5. +, X & cons; test 0,1,() | 67
   6. When to simplify | 94
   7. Subparts: sublists & subexpressions | 103
   8. Abstract reps w/ funcs | 107
   9. Abstract patterns w/ funcs | 134
  10. Funcs to collect > 1 value | 140
* The Five Rules
   1. Car 5
   2. Cdr 7
   3. Cons 9
   4. Null? 10
   5. Eq? 12
* Dimensions of functions
   o On lats (lists of atoms - flat), numbers or S-expression (hierarchy)
   o Test, insert (L/R), replace, remove
   o Straight/single function, abstracted/generalized
* Data types and structures
   o atom 3
   o number
   o list 3 & 4
   o S-expression 3 & 4
   o lat (list of atoms) 15
   o set 111
   o pair 117 & 118
   o rel 119
more at http://tinyurl.com/kll3de