Similarity of the Bench and Other Cypher Symbols with 15th Century Latin

[Dobri]

A 2-letter arrangement "ab" gives only two permutation choices, "ab" and "ba".
A 3-letter arrangement "abc" gives 3! = 6 permutations where the selection of each permutation would depend on the symbols adjacent to the bench.
The addition of a fourth benched symbol (gallows or vowel (?) shapes) further increases the number of prospective choices.