These are mostly cosmetic

Chapter 13

p.275

# output:  feefee    ->   # output:
           fie       ->    feefee
           foe       ->    fie
           ...       ->    ...

Chapter 14

p.297  lower middle of page

  # Output : The value of the yield expression was 'mother'

# output:
 The value of the yield expression was 'mother'

p.298 top and lower middle of page

  # Output:  Washington   ->   # output:
             Adams        ->     Washington
             Jefferson    ->     Adams
                                 Jefferson

  # Output:  Was   ->   # output:
             Ada   ->     Was
             Jef   ->     Ada
                          Jef

p.299 middle of page  [1.2.3] -> [1,2,3]

# same effect as:  [1.2.3].map {|num| num*num} -> [1,2,3]

p.300 top of page

  # Output:  @@@@@   ->   # output:
             @@@     ->     @@@@@
             @       ->     @@@
                            @
p,303 top of page

  # Output:  Starting...   ->   # output:
  #          Working...    ->     Starting...
  #          Done.         ->     Done...
                                  Working.

p.306 first sentence

....in which the case the block... -> ..in which case the block...

p.309  line 2: - > line 3:

....here's another way to write line 2: -> ..line 3:

Chapter 15

p 315 2nd paragraph, stray underscore '_'

load_'matrix.rb'  ->  load 'matrix'.rb

p.332 in problem 2 ???

#output:   -68 -94 -2 -11 -7 -50

# output:
 -68 -94 -2 -11 -7 -50