gistfile1.txt

module A
  def a_method
    "a method"
  end
end

module B
  extend A
  
  def b_method
    "b method"
  end
end

class C
  include B
  
  def c_method
    "c method"
  end
end

c = C.new
puts c.c_method
puts c.b_method
puts c.a_method