class Class1
  def initialize(a, b, c)
    @a = a
    @b = b
    @c = c
  end
end

class Class2 <  Class1
  def initialize(a, b, c, d, e, f)
    super(a, b, c)
  end
end

class Class3 < Class1
  def initialize(a, b, c)
    super
  end
end

class Class4 < Class1
  def initialize(a, b, c)
    #super()
  end
end

ob2 = Class2.new(1,2,3,4,5,6)
ob3 = Class3.new(1,2,3)
ob4 = Class4.new(1,2,3)

p(ob2)
p(ob3)
p(ob4)