February 2, 2004	Intro to Ruby	Slide #27
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Mixins

If you include a module inside a class, then all the methods defined in the module before instance methods in the class
include has nothing to do with files

     module Pie
       def pie
         puts "I like pie"
       end
     end
     
     class Array
       include Pie
     end
     
     a = []
     a.pie  # prints "I like pie"