Greek morphology code rules (normalized from code_description_dictionary_entries.csv)
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Purpose
- This file rewrites the flat code inventory into a compact rulebook.
- The source CSV is mostly an expanded inventory of allowed tags.
- Many tags can be generated from a small set of part-of-speech codes,
  feature codes, and composition patterns.
- A few rows in the CSV look irregular or legacy-like; those are listed
  under 'Special / irregular entries' rather than treated as normal grammar.

1) Part-of-speech and base category codes
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A: adjective
A1P: adjective, 1st declension, -οσ/-α/-ον pattern endings
A3: adjective, 3rd declension pattern endings
N: noun
M: indeclinable number
M3M: indeclinable number (special subtype found in the CSV)
RA: article
RD: demonstrative pronoun
RI: interrogative / indefinite pronoun
RP: personal / possessive pronoun
RR: relative pronoun
RX: relative pronoun, ὅστις-type
V: verb
C: conjunction
D: adverb
P: preposition
I: interjection
X: particle

2) Feature code meanings
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Case:
  N: nominative / nom
  G: genitive / gen
  D: dative / dat
  A: accusative / acc
  V: vocative / voc
Number:
  S: singular / sing
  P: plural / plur
  D: dual
Gender:
  M: masculine / masc
  F: feminine / fem
  N: neuter / neut
Degree:
  C: comparative
  S: superlative

Verb tense/aspect code:
  P: present
  I: imperfect
  F: future
  A: aorist
  X: perfect
  Y: pluperfect
Verb voice code:
  A: active
  M: middle
  P: passive
Verb mood / form code:
  I: indicative / ind
  S: subjunctive / subj
  O: optative / opt
  D: imperative / imper
  N: infinitive / infin
  P: participle / part
Person:
  1: 1st person
  2: 2nd person
  3: 3rd person

3) Main code patterns
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A. Simple part of speech
   CODE := POS
   Examples: C, P, X, I, A, N

B. Nominal pattern
   CODE := POS '.' CASE NUMBER [GENDER] [DEGREE]
   Applies mainly to: A, N, M, RA, RD, RI, RP, RR, RX
   Examples:
     A.NSM   = adjective, nominative singular masculine
     A.GPFC  = adjective, genitive plural feminine comparative
     N.ASN   = noun, accusative singular neuter
     RA.GSM  = article, genitive singular masculine
     RR.NPF  = relative pronoun, nominative plural feminine

C. Verb finite pattern
   CODE := V '.' TENSE VOICE MOOD PERSON NUMBER
   Examples:
     V.PAI3S = verb, present active indicative, 3rd singular
     V.AMI1P = verb, aorist middle indicative, 1st plural
     V.FPS2S = verb, future passive subjunctive, 2nd singular

D. Verb infinitive pattern
   CODE := V '.' TENSE VOICE N
   Examples:
     V.PAN   = verb, present active infinitive
     V.AMN   = verb, aorist middle infinitive
     V.XPN   = verb, perfect passive infinitive

E. Verb participle pattern
   CODE := V '.' TENSE VOICE P CASE NUMBER GENDER
   Examples:
     V.PAPNSM = verb, present active participle, nominative singular masculine
     V.AMPASF = verb, aorist middle participle, accusative singular feminine
     V.XPPGPN = verb, perfect passive participle, genitive plural neuter

F. Compound pattern
   CODE := POS '+' POS [ '.' FEATURES ]
   Examples:
     C+D        = conjunction + adverb
     C+X        = conjunction + particle
     P+X        = preposition + particle
     C+RP.NSM   = conjunction + relative pronoun, nominative singular masculine
     P+A.ASM    = preposition + adjective, accusative singular masculine
     RD+N.GSM   = demonstrative pronoun + noun, genitive singular masculine

4) Reading the nominal feature clusters
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NSM  = nominative singular masculine
NPF  = nominative plural feminine
GPN  = genitive plural neuter
DSF  = dative singular feminine
APMC = accusative plural masculine comparative
VSMS = vocative singular masculine superlative

Some codes omit gender or degree when the form does not distinguish them.
Examples from the CSV:
  N.A   = noun, accusative
  RI.GS = interrogative / indefinite pronoun, genitive singular
  RP.NP = personal / possessive pronoun, nominative plural

5) Reading the verb clusters
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PAI3S   = present active indicative 3rd singular
AAI1P   = aorist active indicative 1st plural
FMO2S   = future middle optative 2nd singular
APN     = aorist passive infinitive (pattern expectation; see irregular notes below)
PAPNSM  = present active participle nominative singular masculine
MPPAPN  = middle/passive participle accusative plural neuter

6) Special / irregular entries to treat cautiously
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These rows appear in the CSV but do not fit the compact grammar cleanly,
or they use unusual / legacy notation.

A.B: adjective,
A.P: adjective, Pres
D.P: adverb, Pres
N.AAN: noun, Aor Act Infin
N.G/D: noun, Gen/Dat
N.N M: noun, Nom Masc
V.AI3P: verb, Fut Act Ind 3rd Plur
V.APN: verb, Acc Plur Neut
V.XPP2S: verb, Perf Pass Ind 2nd Sing
V.ZMI3S: verb, Fut Pass Ind 3rd Sing

7) Suggested use in prompts / validators
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For AI prompting or validation, prefer the compact grammar above plus:
- the base category table
- the feature code tables
- a short set of examples
- the explicit special / irregular list

That is easier to maintain than pasting the full flat inventory into a prompt.