Variable-length Figure Cipher used by Duke of Lorraine (ca.1620?)

I succeeded in reconstructing a cipher used in a letter to the Duke of Lorraine (ca.1620?) and uploaded it in a new article, "Variable-Length Figure Cipher of Duke of Lorraine (ca.1620?)". I abandoned this before, but I took it up again and this time, two occurrences of the word "temperament" provided a first clue. Unexpectedly, the cipher employed variable-length symbols. That is, code symbols consist of one to three symbols. Since the figures are written without a break, there was some difficulty in identifying code symbols corresponding to plaintext segments.
This kind of variable-length symbols written continuously without a break are often seen in Vatican ciphers. It is yet to be studied how this system came to be used by the Duke of Lorraine's correspondence.