code: def frame_iv(algorithm, sequence_number):
      
      if sequence_number < 1 or sequence_number > MAX_FRAME_COUNT:
          raise ActionNotAllowedError(
              "Invalid frame sequence number: {actual}\nMust be between 1 and {max}".format(
                  actual=sequence_number, max=MAX_FRAME_COUNT
              )
          )
      prefix_len = algorithm.iv_len - 4
      prefix = b"\x00" * prefix_len
      return prefix + struct.pack(">I", sequence_number)
docs: Builds the deterministic IV for a body frame.
  
      :param algorithm: Algorithm for which to build IV
      :type algorithm: aws_encryption_sdk.identifiers.Algorithm
      :param int sequence_number: Frame sequence number
      :returns: Generated IV
      :rtype: bytes
      :raises ActionNotAllowedError: if sequence number of out bounds