class Test_A
    attr_accessor :a
    attr_accessor :b
    attr_accessor :c
end

test = Test_A.new()
test.a = 3

class Test_B < Test_A
    private
        attr_accessor :d
        attr_accessor :e
end

test = Test_B.new()
test.a = 3

class Test_A
  attr_accessor :d, :e
end

class Test_B < Test_A
  private :d, :d=, :e, :e=
end