This tree structure seems similar to ikegami's code, however I haven't understood that fully yet, so I'm not sure what's the difference.
My tree is the same as your $ctree:
A -- ...
\ X -- P -- ...
e -- n -- o -- c -- ...
except numbers are considered atomic in mine.
I don't bother collapsing into your $stree form:
A -- ...
\ XP -- ...
enoc -- ...
You must type the marked characters, but the others are optional
The difference with mine is that I made more character mandatory. The rational is that the OP wanted to the result to resemble the original as much as possible.
Your mandatory characters:
Lenoc3_duallayer_1 -> Le3d1
^^ ^ ^ ^
My mandatory characters:
- Ambiguous characters.
- A sequence of 0+ uppercase letters followed by a sequence of 0+ lowercase letters preceding an ambiguous lowercase letter.
- First and second unambiguous character of a text sequence
- Nonletters (digits, underscores)
Lenoc3_duallayer_1 -> Len3_du_1
^^^ ^^^^ ^^
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