class Parent
  def mr_public
    'public'
  end

  def access_other_protected(other)
    other.mr_protected
  end

  def access_other_private(other)
    other.mr_private
  end

  def access_self_protected
    self.mr_protected
  end

  def access_self_private
    self.mr_private
  end

  protected

  def mr_protected
    'protected'
  end

  private

  def mr_private
    'private'
  end
end

class Child < Parent
  def access_parent_protected
    mr_protected
  end

  def access_parent_private
    mr_private
  end
end

def attempt
  puts yield
rescue
  puts 'forbidden'
end

parent = Parent.new
other = Parent.new
child = Child.new

attempt { parent.mr_public  }
attempt { parent.mr_protected  }
attempt { parent.mr_private  }

attempt { parent.access_self_protected  }
attempt { parent.access_self_private  }

attempt { parent.access_other_protected(other)  }
attempt { parent.access_other_private(other)  }

attempt { child.access_parent_protected  }
attempt { child.access_parent_private  }