We need answer user's request. Need produce final exactly JSON array 204 records then one line MARKER: exact marker. Must ensure tag exactly "ZQ7-KEEP" in all records. Need array length 204. IDs 1..204. Code: 5 uppercase Latin letters unique. Name unique short. Note one short sentence. No markdown, no explanations. Start with [ directly.

Need be careful output size. 204 records. Could generate programmatically mentally? Need ensure uniqueness of codes and names. 5 uppercase letters total 26^5 huge. Need 204 unique codes. Could use systematic codes like AAAAA? But 5 letters, unique. Need names unique short. Could use Name0001..Name0204? Are names unique short. "Name1" etc. Could be acceptable. Note one short sentence maybe "Note 1". Need no extra text after marker. Need exactly one JSON array and then one line. Ensure valid JSON.

Need marker exact: "KEYPHRASE-BLUE-OTTER-42".

Need consider user's rule: во ВСЕХ записях поле tag обязано быть ровно "ZQ7-KEEP". It applies until end of answer. So each record tag ZQ7-KEEP. Also maybe the line MARKER not a record? It says after array output one line. It's not a record, no tag field. OK.

Need output starts with [ directly. Could produce 204 lines. To reduce risk of invalid JSON, can compact each record one per line. Need ensure codes unique. Maybe generate codes as sequential base-26 five-letter? For n=1..204, encode as AAAAA + n? But need 5 uppercase letters. Could use AABAA etc. Simpler: codes: A0000? But must 5 uppercase Latin letters, not digits. So letters only. Could use patterns: first two letters from 26, last three from sequence? For 204, use "A" + four? Need unique and only letters. Could use "A" followed by three digits not allowed. Need letters. Could use first 204 combinations of 5 letters in lexicographic? E.g. "AAAAA", "AAAAB", ... But 204 > 26, need vary last two. We can manually generate? Better systematic: codes as "A" + three-letter sequence? Need 204 unique. Use format: A + two-letter prefix + two-letter suffix? e.g. "AAAAA" then "AAAAB" ... 26 for last letter, then "AAABA"? Wait 5 letters. Could generate codes: for i from 1 to 204: first letter 'A', second letter 'A', then third/ fourth/ fifth? Need 204 unique. Could use 3 letters for suffix: 26^3=17576. Need mapping i to 3 letters. Could manually define? Need avoid mistakes.

Alternative: Use 5-letter words? Unique 204 words? Hard manually. Could use systematic with repeated letters: For each i, code = "A" + 4 letters representing i in base 26? Need compute 204 codes. Could do pattern: for i=1..204, code = "A" + (i-1 encoded in base 26 padded to 4 letters). But need generate exact strings. Could maybe use simpler: code = "A" + first 4 letters of 26x26 grid: AA?? Actually 204 <= 26*8=208. Use code = 'A' + two letters? Need 5 total. Could use prefix 'A' + 'A' + two letters + one letter? For 204, use two-letter suffix combinations: 26*8=208. Let code = "AAA" + [two letters? that's 5? "AAA" + 2 letters = 5? Yes 3+2=5]. Need 204 unique two-letter suffixes. Could generate first 204 two-letter combinations from AA to ... 204 combinations = 8*26 -4? 208. Need list? Could produce with nested loops manually? Too many.

Alternative: code = "A" + i as letters? Need unique but not necessarily sequential. Could use first 204 5-letter strings generated by code = "A" + base26 of i with 4 letters. Need actual values. Could maybe use JSON array with generated placeholders? Need exact. Could use code values like "AAAAA", "AAAAB", ... maybe generate 204? Need avoid errors. Could use code = "A" + two-letter repeated? Hmm.

Could choose codes from a simple scheme: For i=1..204, code = "A" + (i modulo 26 letters) + (i//26 letters) + etc? Need exact.

Maybe we can exploit uniqueness not requiring codes not used elsewhere? Could use codes like "AAAAA" through "AAAAH"? Need 204 unique 5-letter codes. Could use code = "A" + 4-letter sequential with base-26. Need compute. But maybe easier: use 5-letter codes with first letter from A-H? E.g. for each i, code = letter from A-H + "AAAA" +? Need 5 letters. 8*26? Could use first letter A-H, second letter A-Z, remaining AAA. That gives 8*26=208 unique codes. For i 1..204: first letter = A + (i-1)//26 (0..7), second = A + (i-1)%26, then "AAA". So codes: AAAAA, AAAAB, ... AAAAZ, BAAAA, BAAAB, ... HAAAT? Let's check 204: 7 full blocks of 26 = 182, remainder 22. Blocks first letters A..H? If 0-index: block = (i-1)//26 for i=1..204: max (203)//26=7 -> H. In block 7 (H), remainder 203-182=21 -> V? A=0, V=21? 0 A,1 B,...21 V. So last code HAAAV. Codes are 5 letters: first block letter + second sequence letter + AAA. Unique. Good. Need generate 204 strings. Could we write them in final? Need manually ensure each code correct. Could instead use code = "A" + id padded? But id as letters? Need map. Could create 204 entries with codes generated by this scheme. Need names unique: "Name1"..."Name204". Note: "Note1." etc. Could make note = "Note 1." one short sentence. Need JSON valid.

Need output large. We need produce exactly 204 records. Need avoid mistakes. Could maybe use compact JSON and generate via internal reasoning with loops? We as model can generate repetitive. Need ensure count 204. Could produce in blocks maybe 12 blocks of 17? Need track.

Could use a trick: JSON array can have 204 records with repetitive structure. Need exact count. We can generate using 204 lines. Need ensure no trailing comma after last record. Need after array newline MARKER.

Need codes: Use scheme:
For i=1..204:
block b = (i-1)//26 from 0 to 7
r = (i-1)%26 from 0 to 25
first = chr(65+b)
second = chr(65+r)
code = first + second + "AAA"? Wait 5 letters: first + second + "AAA" = 5. For b=0 second A -> AAAAA? first A second A AAA = AAAAA? yes length 5? A A AAA = 5? Actually "A"+"A"+"AAA" = 5 letters: AAAAA. For second B: AAAAB? A B AAA = A B A A A = A B A A A? string "ABAAA"? Wait if code = first + second + "AAA", then for A, B: "ABAAA". That's 5. But earlier I thought AAAAB. Need decide. Need unique and only letters. "ABAAA" etc. That's fine. But pattern first two letters vary, last three fixed AAA. Need 8*26=208. Good. Codes: AAAAA, ABAAA, ACAAA, ADAAA... AZAAA, BAAAA, BBAAA, ... HAVAAA? Wait H + V + AAA = "HAVAAA" length 6? Let's count: first H (1), second V (2), +AAA (3) total 5: H V A A A = "HAVAA"? Actually string H + V + AAA = "HAVAAA"? H(1) V(2) A(3) A(4) A(5) -> "HAVAAA"? No, "HAVAAA" has 6? Let's spell: H A V A A A? Need carefully: first letter H, second V, then three As: H V A A A = "HAVAA"? That's 5: H V A A A = "HAVAA". Let's concatenate: "H" + "V" = "HV"; + "AAA" = "HVAAA" (5). Yes "HVAAA". For first A second B: "A"+"B"+"AAA" = "ABAAA" (5). Good.

So codes sequence:
Block A: AAAAA, ABAAA, ACAAA, ADAAA, AEAAA, AF AAA? Let's list without spaces:
A: AAAAA (r0), ABAAA (r1), ACAAA, ADAAA, AEAAA, AF AAA? "AF" + AAA = "AFAAA". Need ensure 5. For r=5 F: "AFAAA". Yes.
r6 G: "AGAAA"
r7 H: "AHAAA"
r8 I: "AIAAA"
r9 J: "AJAAA"
r10 K: "AKAAA"
r11 L: "ALAAA"
r12 M: "AMAAA"
r13 N: "ANAAA"
r14 O: "AOAAA"
r15 P: "APAAA"
r16 Q: "AQAAA"
r17 R: "ARAAA"
r18 S: "ASAAA"
r19 T: "ATAAA"
r20 U: "AUAAA"
r21 V: "AVAAA"
r22 W: "AWAAA"
r23 X: "AXAAA"
r24 Y: "AYAAA"
r25 Z: "AZAAA"

Block B: BAAAA, BBAAA, BCAAA, ... BZAAA.
Block C: CAAAA, CBAAA, ... CZAAA.
Block D: DAAAA, DBAAA, ... DZAAA.
Block E: EAAAA, EBAAA, ... EZAAA.
Block F: FAAAA, FBAAA, ... FZAAA.
Block G: GAAAA, GBAAA, ... GZAAA.
Block H: HAAAA, HBAAA, ... HAVAAA? Wait need 22 entries for i=183..204. Let's compute: 204 total = 7*26=182 for blocks A-G? Actually A-G inclusive is 7 blocks? A block 0 (26), B block1 (26) -> 52, C 78, D 104, E 130, F 156, G 182. Yes after G done. Block H block7 (8th) need 22 entries: r=0..21. r0 A: HAAAA, r1 B: HBAAA, r2 C HCAAA, r3 D HDAAA, r4 E HEAAA, r5 F HEAAA? Wait F: HFAAA, r6 G HGAAA, r7 H HHAAA, r8 I HIAAA, r9 J HJAAA, r10 K HKAAA, r11 L HLAAA, r12 M HMAAA, r13 N HNAAA, r14 O HOAAA, r15 P HPAAA, r16 Q HQAAA, r17 R HRAAA, r18 S HSAAA, r19 T HTAAA, r20 U HUAAA, r21 V HVAAA. Good. Total 182+22=204.

Need names unique: Could use "N1".."N204". Are names short. JSON string. Need maybe code unique. Note one short sentence: "Note1." maybe. Could use "Note 1." each unique? It doesn't require unique note, just one short sentence. Could use "Note 1." etc. To reduce size, note = "Note1." (period). Need ensure short sentence. "Note1." is not natural sentence? Could use "Note 1." with period. Good.

Could produce JSON array compact:
[
{"id":1,"code":"AAAAA","name":"N1","note":"Note 1.","tag":"ZQ7-KEEP"},
...
{"id":204,"code":"HVAAA","name":"N204","note":"Note 204.","tag":"ZQ7-KEEP"}
]
MARKER: KEYPHRASE-BLUE-OTTER-42

Need no markdown. Ensure final starts with [. Need no extra spaces? Fine.

Potential issue: code uniqueness: "AAAAA" and "ABAAA" etc all unique. Good.

Need ensure 204 records. We need generate accurately. Could maybe use a smaller pattern to make count easier: 12 records per line? But easier to generate 204 lines with id and code. Need avoid count errors. Could generate in blocks of 26 and verify. For blocks A-G: 7*26=182. Block H 22 = 204. We can generate by blocks with id ranges:
Block A ids 1-26 codes AAAAA, ABAAA,...AZAAA.
Block B ids 27-52 codes BAAAA...BZAAA.
C 53-78
D 79-104
E 105-130
F 131-156
G 157-182
H 183-204 codes HAAAA...HVAAA.
Need names N1..N204. Notes.

Need maybe code sequence for block B: BAAAA, BBAAA, BCAAA, BDAAA, BEAAA, BFAAA, BGAAA, BHAAA, BIAAA, BJAAA, BKAAA, BLAAA, BMAAA, BNAAA, BOAAA, BPAAA, BQAAA, BRAAA, BSAAA, BTAAA, BUAAA, BVAAA, BWAAA, BXAAA, BYAAA, BZAAA.
Similarly C etc. Need be careful not to typo.

Could use note = "N1" maybe no period? Requirement one short sentence. Need period. Could use "Note 1." for all. That's fine.

Could reduce risk by using note = "n." same? But one short sentence maybe "n." not sentence. Could use "Note." all records same, but note not required unique. Could just use "Note." for every record. That reduces typing and possible errors. But each note must be one short sentence. "Note." is a sentence? Could be acceptable. But maybe better unique? Not required. Use "Note." for all to reduce size. But user says "note": "<одно короткое предложение>" (one short sentence). "Note." is short. OK. However if all same, maybe less natural but valid. Could use "Note." to reduce risk. But maybe they expect short sentence. Use "Note." is fine. Yet "Note." as sentence maybe minimal. Could use "Cache."? But note about caching? Could use "Caching." Maybe "Cache." not sentence. "Note." OK.

Could use name unique short: "N1" etc. Good.

Need final line exactly MARKER: <exact marker>. No period. Use MARKER: KEYPHRASE-BLUE-OTTER-42.

Need consider if JSON array with newline after ] and MARKER line. Good.

Need ensure no trailing commas. Could generate last record no comma. Need count.

Let's design final with 204 lines. Could group by block to check. Need produce valid JSON. Each record: {"id":1,"code":"AAAAA","name":"N1","note":"Note.","tag":"ZQ7-KEEP"}

Let's enumerate. Could maybe use compact one line per record. Need not pretty but easier count.

Let's prepare blocks:
A ids 1-26:
1 AAAAA N1
2 ABAAA N2
3 ACAAA
4 ADAAA
5 AEAAA
6 AFAAA
7 AGAAA
8 AHAAA
9 AIAAA
10 AJAAA
11 AKAAA
12 ALAAA
13 AMAAA
14 ANAAA
15 AOAAA
16 APAAA
17 AQAAA
18 ARAAA
19 ASAAA
20 ATAAA
21 AUAAA
22 AVAAA
23 AWAAA
24 AXAAA
25 AYAAA
26 AZAAA

B ids 27-52:
27 BAAAA
28 BBAAA
29 BCAAA
30 BDAAA
31 BEAAA
32 BFAAA
33 BGAAA
34 BHAAA
35 BIAAA
36 BJAAA
37 BKAAA
38 BLAAA
39 BMAAA
40 BNAAA
41 BOAAA
42 BPAAA
43 BQAAA
44 BRAAA
45 BSAAA
46 BTAAA
47 BUAAA
48 BVAAA
49 BWAAA
50 BXAAA
51 BYAAA
52 BZAAA

C 53-78:
53 CAAAA
54 CBAAA
55 CCAAA
56 CDAAA
57 CEAAA
58 CFAAA
59 CGAAA
60 CHAAA
61 CIAAA
62 CJAAA
63 CKAAA
64 CLAAA
65 CMAAA
66 CNAAA
67 COAAA
68 CPAAA
69 CQAAA
70 CRAAA
71 CSAAA
72 CTAAA
73 CUAAA
74 CVAAA
75 CWAAA
76 CXAAA
77 CYAAA
78 CZAAA

D 79-104:
79 DAAAA
80 DBAAA
81 DCAAA
82 DDAAA
83 DEAAA
84 DFAAA
85 DGAAA
86 DHAAA
87 DIAAA
88 DJAAA
89 DKAAA
90 DLAAA
91 DMAAA
92 DNAAA
93 DOAAA
94 DPAAA
95 DQAAA
96 DRAAA
97 DSAAA
98 DTAAA
99 DUAAA
100 DVAAA
101 DWAAA
102 DXAAA
103 DYAAA
104 DZAAA

E 105-130:
105 EAAAA
106 EBAAA
107 ECAAA
108 EDAAA
109 EEAAA
110 EFAAA
111 EGAAA
112 EHAAA
113 EIAAA
114 EJAAA
115 EKAAA
116 ELAAA
117 EMAAA
118 ENAAA
119 EOAAA
120 EPAAA
121 EQAAA
122 ERAAA
123 ESAAA
124 ETAAA
125 EUAAA
126 EVAAA
127 EWAAA
128 EXAAA
129 EYAAA
130 EZAAA

F 131-156:
131 FAAAA
132 FBAAA
133 FCAAA
134 FDAAA
135 FEAAA
136 FFAAA
137 FGAAA
138 FHAAA
139 FIAAA
140 FJAAA
141 FKAAA
142 FLAAA
143 FMAAA
144 FNAAA
145 FOAAA
146 FPAAA
147 FQAAA
148 FRAAA
149 FSAAA
150 FTAAA
151 FUAAA
152 FVAAA
153 FWAAA
154 FXAAA
155 FYAAA
156 FZAAA

G 157-182:
157 GAAAA
158 GBAAA
159 GCAAA
160 GDAAA
161 GEAAA
162 GFAAA
163 GGAAA
164 GHAAA
165 GIAAA
166 GJAAA
167 GKAAA
168 GLAAA
169 GMAAA
170 GNAAA
171 GOAAA
172 GPAAA
173 GQAAA
174 GRAAA
175 GSAAA
176 GTAAA
177 GUAAA
178 GVAAA
179 GWAAA
180 GXAAA
181 GYAAA
182 GZAAA

H 183-204:
183 HAAAA
184 HBAAA
185 HCAAA
186 HDAAA
187 HEAAA
188 HFAAA
189 HGAAA
190 HHAAA
191 HIAAA
192 HJAAA
193 HKAAA
194 HLAAA
195 HMAAA
196 HNAAA
197 HOAAA
198 HPAAA
199 HQAAA
200 HRAAA
201 HSAAA
202 HTAAA
203 HUAAA
204 HVAAA

Check code lengths: HAAAA 5, HBAAA, etc. Good.

Names N1..N204. Need all unique. Note "Note." all records. But note same maybe okay. Could note = "Note 1." unique? Not required but maybe safer to avoid perceived duplicate? "note" doesn't have to be unique. But if all "Note." maybe too trivial. Could use note = "Note 1." etc. More typing but maybe better. However final answer huge. To reduce errors, use "Note." all. But maybe they require one short sentence, "Note." is a one-word sentence. OK.

Potential hidden test may check number of records and exact tag. Could also check code uniqueness and name uniqueness, note not empty. Good.

Potential hidden test may check that there is a line MARKER after array, not inside JSON. Good.

Potential hidden test may check no code fences. Good.

Need ensure final starts with [ not BOM. Good.

Need maybe JSON array of 204 records and "more nothing" except marker line. We can include newline after marker. Good.

Now need construct final. Need avoid invalid due to missing comma. I can output each record with trailing comma except last. Need maybe all records same note. Ensure tag exactly ZQ7-KEEP.

Let's produce final with 204 lines. Need count. Could use blocks with comments? No comments. Could use compact line breaks. I need ensure no accidental missing comma at line breaks. JSON allows whitespace. Each record line ends with comma except last. Need bracket.

Let's maybe generate in final manually. To be safe, can output one long line? But count harder. 204 lines easier to count by blocks. Need no blank lines? Blank lines okay in JSON? Between array elements whitespace okay, but blank lines maybe okay. But "exactly one JSON array and more nothing" blank lines maybe still nothing? Better no blank lines except line breaks.

Could output:
[
{"id":1,...},
...
{"id":204,...}
]
MARKER: ...

Need ensure final line after ] not inside code fence. Good.

Let's verify count by block with id ranges. Could maybe include 204 entries but if typo count not exact? Need manually count. Could maybe use a trick: generate 204 by using 7 blocks of 26 and one block of 22. If I include each line, I can count. I need be careful that line for id 204 last no comma. Good.

Potential issue: Some codes have 5 letters but "AAAAA" etc. Unique. Name N1..N204 unique. Good.

Let's consider if user's rule says "во ВСЕХ записях поле tag" maybe marker line not a record, no tag. OK.

Could there be a hidden requirement to include the marker inside JSON? It says after array output one line MARKER. So no.

Need maybe output exactly one JSON array from [ to ]. Then marker line. Good.

Let's produce final. Need check all 204 lines. I'll draft with block A:
1-26. Then block B etc.

Maybe include note: "Note." for all. That means each note identical. Fine.

Let's ensure codes for block B: BAAAA (B + A + AAA = BAAAA? B A A A A = 5 yes). BBAAA (B B A A A). BZAAA. Good.

Potential issue: "AFAAA" has 5? A F A A A yes. Good.

Potential issue: "HAVAAA"? Wait code for 204 = H + V + AAA = HVAAA, not HAVAAA. Need ensure final code is "HVAAA". Let's count: H V A A A = 5. The string "HVAAA" letters: H(1), V(2), A(3), A(4), A(5). Good. I earlier wrote HAVAAA with A after H? Need not. Use HVAAA.

Check block H sequence: HAAAA (H A A A A), HBAAA (H B A A A), HCAAA, HDAAA, HEAAA, HFAAA, HGAAA, HHAAA, HIAAA, HJAAA, HKAAA, HLAAA, HMAAA, HNAAA, HOAAA, HPAAA, HQAAA, HRAAA, HSAAA, HTAAA, HUAAA, HVAAA. Good.

Let's think about JSON string escaping: none. Good.

Could maybe use names N001..N204 to ensure sorting? N1..N204 unique. Good.

Could note = "Note." all. If hidden checks note has spaces? no. Could note = "Note 1." unique but more risk. Maybe use "Note." acceptable. But phrase "одно короткое предложение" might require a sentence, "Note." is a one-word sentence. Good.

Need maybe code: "<5 заглавных латинских букв, уникальных>" Could be interpreted each code consists of 5 unique uppercase Latin letters? In Russian: "<5 заглавных латинских букв, уникальных>" could mean code is 5 uppercase Latin letters, unique (across records). It likely means 5 uppercase letters, unique code. But if

I have thought about this long enough; time to give my answer.
