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class Person
  include Comparable
  attr_accessor :name
  def initialize(name)
    @name = name
  end
  
  def <=>(other_person)
    self.name <=> other_person.name
  end
  
  def to_s
    "Hello my name is #{@name}"
  end
end

people = [Person.new("joe"),Person.new("mary"),Person.new("annie"),Person.new("bob")]
sorted_people = people.sort
sorted_people.each {|person| puts person }