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class HelloWorld

  # This is a class method
  def self.from_class
    puts "Hello from a class method"
  end

  def say_hello
      puts "hello".upcase
  end
end

# Can be re-opened again
class HelloWorld
  def say_hello_again
      puts "hello again".upcase
  end
end

# Creating an object
helloWorld =  HelloWorld.new
HelloWorld.from_class # => Hello from a class method
helloWorld.say_hello  #  => HELLO
helloWorld.say_hello_again # => HELLO AGAIN
helloWorld.from_class # => undefined method `from_class ...