code: def copy(self):
      
      if 0:  # set this to 1 to make the flow space crash
        return copy.deepcopy(self)
      clone = self.__class__()
      clone.length = self.length
      clone.count = [] + self.count[:]
      clone.input = [] + self.input
      clone.A = self.A
      clone.B = self.B
      clone.C = self.C
      clone.D = self.D
      return clone
docs: Return a clone object.
  
      Return a copy ('clone') of the md5 object. This can be used
      to efficiently compute the digests of strings that share
      a common initial substring.