class App
  def a
    "a"
  end
  require_relative 'b'
end

class App
  def b
    "b"
  end
end

class App
  def a
    "a"
  end
end

class App
  def b
    "b"
  end
end

class App
  def a
    "a"
  end
  class App
    def b
      "b"
    end
  end
end