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class Image
  def initialize(array)
    @array = array
    @new_array = @array.map {|e| Array.new(e.size) }
  end

  def blur
    @array.each_with_index do |row,x|
      row.each_with_index do |cell,y| 
        last_x_pixel = row.size - 1

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class Image
  attr_accessor :array

  def initialize(array)
    @array = array
    @cells = []
    @new_array = @array.map {|e| Array.new(e.size) }
  end

  def all_array_indexes 

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class LinkedListNode
  attr_accessor :value, :next_node
 
  def initialize(value, next_node=nil)
    @value = value
    @next_node = next_node
  end
end

def print_values(list_node)

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class LinkedListNode
  attr_accessor :value, :next_node
 
  def initialize(value, next_node=nil)
    @value = value
    @next_node = next_node
  end
end

def print_values(list_node)

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# In the above example it will check to see if the payload is 11 in the following order: 2, 7, 6, 5 when 
# it gets to 5 and 5 has no children, it will return to the 6 and go to any children 6 has. 6 has a 
# remaining child, which is 11 so that node is checked and since that value is the correct value it 
# will be returned and searching will stop.

class Tree
    attr_accessor :payload, :children

    def initialize(payload, children)
        @payload = payload

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require 'minitest/autorun'

module Luhn
  def self.is_valid?(number)
	digits = number.to_s.split("")
	digits.map! {|x| x.to_i }
 	ary = Array.new
 		
 	digits.each_with_index do |value, index|
	  if index.even?