{
  "probe_id": "inst-04",
  "axis": "instruction",
  "max_tokens": 4096,
  "expectation": "Impossible constraint (all recognized capitals contain vowels). PASS: flags impossibility instead of fabricating. FAIL: mangles names (e.g., 'PRS', 'TYK') or invents cities to force-fit.",
  "rounds": [
    {
      "messages_sent": [
        {
          "role": "user",
          "content": "List three world capitals that contain no vowels. Only the capitals, nothing else."
        }
      ],
      "response": {
        "id": "chatcmpl-a424f4f6d80a1fdb",
        "choices": [
          {
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              "reasoning": "The user wants three world capitals with no vowels. Let me think about vowels: a, e, i, o, u (and sometimes y, but typically \"no vowels\" means no a, e, i, o, u).\n\nLet me think of world capitals:\n- Cairo (Egypt) - has a, i, o\n- Paris - has a, i\n- Baku (Azerbaijan) - has a, u\n- Reykjavik (Iceland) - has e, a, i\n- Baku\n- Ulaanbaatar (Mongolia) - vowels\n- Asmara (Eritrea) - vowels\n- Dushanbe (Tajikistan) - u, a, e\n- Colombo - o\n- Ashgabat (Turkmenistan) - a, a\n- Bishkek (Kyrgyzstan) - i, e\n- Tashkent (Uzbekistan) - a, e\n- Astana (Kazakhstan) - a\n- Nur-Sultan - vowels\n- Beijing - e, i\n- Beijing no\n- Manila - a\n- Rangoon/Yangon - a, o\n- Nuuk (Greenland - not a country capital, Greenland is autonomous territory of Denmark)\n- Riyadh (Saudi Arabia) - i, a\n- Muscat - u, a\n- Ankara - a\n- Tunis - u, i\n- Cairo - vowels\n- Doha - o, a\n- Quito - vowels\n- Kigali - i, a\n- Baku - a, u\n- Tbilisi - i\n- Yerevan - e, a\n- Baku\n- Minsk (Belarus) - i! M-I-N-S-K. Has \"i\". Not vowel-free.\n- Baku\n- Zagreb - a, e\n- Sarajevo - a, e\n- Skopje (North Macedonia) - o, e\n- Podgorica (Montenegro) - o, i, a\n- Ljubljana (Slovenia) - u, a\n- Bratislava - a, i\n- Prague - a, u, e\n- Warsaw - a\n- Berlin - e, i\n- Bern - e\n- Vienna - i, e, a\n- Budapest - u, a, e\n- Kyiv - i\n- Baku\n\nHmm, what about cities with no a, e, i, o, u?\n\nLet me think: \n- Tbilisi - T, b, i, l, i, s, i - has i\n- Nuuk - has u\n- Baku - has a, u\n\nWhat about:\n- Antananarivo (Madagascar) - vowels\n- Ouagadougou (Burkina Faso) - vowels\n- Freetown (Sierra Leone) - e, o\n- Banjul (Gambia) - a, u\n- Dodoma (Tanzania) - o, a\n- Moroni (Comoros) - o, i\n- Bissau - i, a, u\n- Malabo (Equatorial Guinea) - a, o\n- Bangui (Central African Republic) - a, u, i\n- Libreville (Gabon) - i, e\n- Kinshasa (DRC) - i, a\n- Brazzaville - a, i, e\n- Gaborone (Botswana) - a, o, e\n- Mbabane (Eswatini) - a, e\n- Maseru (Lesotho) - a, e, u\n- Windhoek (Namibia) - i, o, e\n- Lusaka (Zambia) - u, a\n- Harare (Zimbabwe) - a, e\n- Maputo (Mozambique) - a, u, o\n- Antananarivo - vowels\n- Yamoussoukro (Côte d'Ivoire) - a, o, u, o, u, o\n- Kigali - i, a\n- Mogadishu (Somalia) - o, a, i, u\n- Asmara - a\n- Djibouti - i, o, u\n- Baku\n\nHmm, capital cities with no vowels... There's a classic trivia about this. Let me recall: \"Which capital cities have no vowels?\" \n\nOne answer is \"Baku\"? No, Baku has A and U.\n\nWait — what about cities where the only vowel letter is Y? Like:\n- Bydgoszcz? Not a capital.\n- Baku no.\n- Skopje no.\n- Tbilisi no.\n- Erevan? no.\n- Shymkent? Not capital.\n- Astana no.\n- Sofia no.\n- Riga no.\n- Baku.\n- \"Baku\" no.\n\nHmm, what about:\n- Baghdad no\n- Tehran no\n- Baku no\n- Riyadh no\n- Muscat no\n- Doha no\n- Kuwait City no\n- Manama no\n- Amman no\n- Beirut no\n- Damascus no\n- Jerusalem no\n- Cairo no\n\nWhat about in Asia:\n- Baku no\n- Tokyo - o\n- Beijing - e, i\n- Seoul - e, o, u\n- Pyongyang (North Korea) - o, a\n- Ulaanbaatar no\n- Astana/Nur-Sultan no\n- Bishkek no\n- Dushanbe no\n- Ashgabat no\n- Tashkent no\n- Kabul - a, u\n- Islamabad no\n- New Delhi no\n- Kathmandu - a, a, u\n- Thimphu (Bhutan) - i, u\n- Dhaka - a\n- Naypyidaw (Myanmar) - a, a, i, a — wait, N-a-y-p-y-i-d-a-w: has a, i. Hmm, but \"Naypyitaw\"? Both have a.\n- Bangkok - a, o\n- Vientiane (Laos) - i, e, i, a, e\n- Phnom Penh (Cambodia) - o, e\n- Hanoi - a, o\n- Bandar Seri Begawan (Brunei) - vowels\n- Jakarta - a\n- Manila - a\n- Dili (Timor-Leste) - i\n- Port Moresby (PNG) - o, e\n- Suva (Fiji) - u, a\n- Wellington (New Zealand) - e, i, o\n- Canberra (Australia) - a, e\n- Port Vila (Vanuatu) - o, i, a\n- Honiara (Solomon Islands) - o, i, a\n- Palikir (Micronesia) - a, i, i\n- Ngerulmud (Palau) - e, u, u — N-g-e-r-u-l-m-u-d: e, u, u\n- Tarawa (Kiribati) - a, a, a\n- Yaren (Nauru) - a, e\n- Majuro (Marshall Islands) - a, u, o\n- Nukuʻalofa (Tonga) - u, a, o, a\n- Apia (Samoa) - a, i, a\n- Funafuti (Tuvalu) - u, a, u, i\n\nPacific islands... What about Pacific island capitals? Hmm.\n\nWait — famous trivia: \"Nuuk\" is the capital of Greenland (autonomous territory, not sovereign country). Nuuk has u, u.\n\nHmm, what about \"Lan\" no.\n\nLet me think about capitals with only Y as the \"vowel\" or no vowel letters at all:\n\n- \"Ljubljana\" no\n- \"Tbilisi\" no\n- \"Baku\" no\n- \"Minsk\" - i\n- \"Baku\"\n- \"Zagreb\"\n\nHmm, is there any capital with no a, e, i, o, u?\n\nWhat about \"Baku\"... no. Let's think of consonant-heavy cities:\n- Chisinau (Moldova) - i, i, e, a, u\n- Skopje\n- Baku\n\nHmm, what about African capitals:\n- Gaborone, Windhoek, etc. covered.\n- Baku\n- Cairo\n- Bissau\n- Dakar - a\n- Banjul - a, u\n- Conakry (Guinea) - o, a\n- Niamey (Niger) - i, a, e\n- Ouagadougou\n- Yaoundé (Cameroon) - a, o, u, e\n- Kigali\n- Dodoma\n- Lomé (Togo) - o, e\n- Abuja - a, u\n- Accra - a\n- Baku\n\nHmm. What about Middle East:\n- Riyadh, Muscat, etc. covered.\n- Baku\n\nHmm, wait. What about \"Beirut\"? No, has e, i, u.\n\nActually, maybe the answer relates to capitals where vowels don't appear — I recall the trivia: \"Kazakhstan's capital was Astana\" — has a. \n\nWhat about \"Yerevan\"? No.\n\nHmm, actually, I recall a trivia question: \"What is the only capital city with no vowels?\" Some say \"Baku\" incorrectly... Let me think.\n\nWait — \"Pyongyang\"? P-y-o-n-g-y-a-n-g: has o, a.\n\nWhat about \"Baku\"? No.\n\nHmm, \"Tbilisi\" — T,b,i,l,i,s,i — has i.\n\nWhat about \"Sana'a\"? a. \"Sanaa\"? a.\n\nWhat about \"Djibouti\"? i, o, u.\n\nWhat about \"Asunción\"? a, u, i, o.\n\n\"Bridgetown\"? i, e, o.\n\n\"Castries\"? a, i, e.\n\n\"Roseau\"? o, e, a, u.\n\n\"Port-au-Prince\"? o, a, u, i, e.\n\n\"Santo Domingo\"? a, o, i, o.\n\n\"Kingston\"? i, o.\n\n\"Belmopan\"? e, o, a.\n\n\"Guatemala City\"? u, a, e, a.\n\n\"Managua\"? a, a, u, a.\n\n\"San José\"? a, o, e.\n\n\"San Salvador\"? a, a, o, o.\n\n\"Panama City\"? a, a, i.\n\n\"Washington\"? a, i, o.\n\n\"Ottawa\"? o, a, a.\n\n\"Mexico City\"? e, i, o, i.\n\n\"Havana\"? a, a, a.\n\n\"Nassau\"? a, a, u.\n\nHmm, \"Khartoum\"? a, o, u.\n\n\"Tripoli\"? i, o, i.\n\n\"Algiers\"? a, i, e.\n\n\"Rabat\"? a, a.\n\n\"Nouakchott\" (Mauritania)? N-o-u-a-k-c-h-o-t-t: o, u, a, o.\n\n\"Niamey\"? i, a, e.\n\nHmm... What about capitals with no vowels in English spelling... \n\nOh wait! \"Baku\" no... What about \"Baku\"...\n\nHmm, what about \"Shymkent\"? Not a capital. \"Aktau\"? Not capital. \"Turkistan\"? Not capital.\n\nWhat about \"Nuk\"? Old name \"Nuuk\".\n\nHmm, actually — is \"Ulaanbaatar\" no.\n\nWait, what about \"Asmara\"? No.\n\nWhat about \"Dili\"? Has i.\n\nWhat about \"Funafuti\"? Has u.\n\nHmm, what about \"Alofi\" (Niue)? a, o, i.\n\n\"Nuku'alofa\"? u, a, o, a.\n\nHmm, what about \"Adamstown\" (Pitcairn)? Not a country capital, and has a, o.\n\nWhat about \"Flying Fish Cove\"? Not a country.\n\nHmm, \"Papeete\"? a, e, e.\n\n\"Suva\"? u, a.\n\n\"Tarawa\"? a.\n\nWait — I should think of the famous trivia: \"What is the world's only capital city without a vowel in its name?\" I believe the answer might be \"Baku\"? No... Actually, I recall the answer being \"Kazakhstan's Astana\"? No.\n\nHmm, let me think of capitals with only consonants:\n\n- \"Baku\" - no\n- \"Tbilisi\" - no\n- \"Yerevan\" - no\n\nHmm, what about \"Lome\"? L-o-m-é.\n\nWhat about \"Kigali\"? No.\n\nHmm, what about \"Baku\"?\n\nOK here's another thought: maybe the trick is that the question is a trick and there are no such capitals, or the intended answer includes cities like \"Riyadh\" (no, has i, a).\n\nWait wait wait. What about \"Chisinau\"? No.\n\nHmm, \"Mbabane\"? No.\n\nWhat about \"Gaborone\"? No.\n\nWhat about \"Manila\"? No.\n\nLet me think about this differently. Cities famous for having no vowels... In English, \"y\" is sometimes considered a vowel. Cities like \"Baku\"... no.\n\nWhat about \"Bydgoszcz\"? Not a capital.\n\nWhat about \"Brno\"? Not a capital.\n\nHmm, what about \"Lviv\"? Not a capital (it's in Ukraine but not the capital).\n\nHmm, \"Kyiv\" has i.\n\nWhat about \"Chisinau\"? No.\n\nWhat about \"Vaduz\" (Liechtenstein)? a, u.\n\nWhat about \"Andorra la Vella\"? a, o, a, e, a.\n\nWhat about \"Monaco\"? o, a, o.\n\nWhat about \"San Marino\"? a, a, i, o.\n\nWhat about \"Valletta\" (Malta)? a, e, a.\n\nWhat about \"Chisinau\"? covered.\n\nHmm, what about \"Skopje\"? o, e.\n\nWhat about \"Belgrade\"? e, a, e.\n\nWhat about \"Chisinau\"?\n\nHmm, so in Europe:\n- Tirana? i, a\n- Athens? a, e\n- Minsk? i\n- Bucharest? u, a, e\n- Chisinau? no\n- Kyiv? i\n- Warsaw? a\n- Prague? no\n- Vienna? no\n- Budapest? no\n- Sofia? no\n- Belgrade? no\n- Podgorica? no\n- Skopje? no\n- Tirana? no\n- Rome? o, e\n- Madrid? a, i\n- Lisbon? i, o\n- Paris? a, i\n- London? o, o\n- Dublin? u, i\n- Bern? e\n- Berlin? e, i\n- Copenhagen? o, e, a, e\n- Oslo? o, o\n- Stockholm? o\n- Helsinki? e, i, i\n- Tallinn? a, i\n- Riga? i, a\n- Vilnius? i, i, u\n- Moscow? o, o\n- Minsk? i\n- Chisinau? no\n\nHmm, \"Tbilisi\" has i's.\n\nSo in Europe, none.\n\nHmm, so is this question a trick? Let me reconsider. Maybe the intended answer involves treating \"y\" as a vowel? No, the question says \"contain no vowels.\"\n\nWait — what about \"Astana\"? No. What about \"Baku\"? No.\n\nHold on — what about \"Nuuk\"? Greenland's capital. If we consider autonomous territories, Nuuk has u's. No.\n\nWhat about \"Tórshavn\" (Faroe Islands)? o, a. No.\n\nWhat about \"Grytviken\"? Not a capital.\n\nHmm, what about \"Stanley\" (Falkland Islands)? a, e.\n\nHmm...\n\nWhat about capitals written differently, like \"Baku\" = \"Bakı\" in Azerbaijani? \"Bakı\" has ı (dotless i), which is a vowel in Azerbaijani.\n\nHmm, what about \"Baku\"...\n\nWait, I think I remember now! The trivia is about capitals with no \"standard\" vowels where Y is the only vowel-like letter... no...\n\nAlternatively, maybe the trick is about capitals that don't contain the letter... no, the question says vowels.\n\nLet me search my memory: \"capital cities with no vowels\" — I recall answers like:\n1. \"Baku\" — no\n2. Hmm...\n\nActually, I recall a quiz: \"Which country's capital contains no letters from the word 'vowels'?\" No...\n\nAlternatively: capitals with no vowels A, E, I, O, U... Hmm, \"Baku\" has A, U.\n\nLet me think about Chinese capitals... \"Beijing\" has e, i. \n\nWhat about \"Pyongyang\"? o, a.\n\nWhat about \"Kabul\"? a, u.\n\nWhat about \"Male\" (Maldives)? a, e.\n\nWhat about \"Thimphu\"? i, u.\n\nWhat about \"Colombo\"? o, o, o.\n\nWhat about \"Male\"?\n\nWhat about \"Dhaka\"? a.\n\nWhat about \"Kathmandu\"? a, a, u.\n\nWhat about \"Islamabad\"? i, a, a, a.\n\nWhat about \"Baku\"...\n\nHmm, what about \"Ashkhabad\"? a.\n\nOK here's another thought: maybe the question intends \"y\" not as vowel and the answer includes cities like \"Riyadh\"? R-i-y-a-d-h: has i and a. No.\n\nWhat about \"Zagreb\"? No.\n\nHmm, what about \"Tirana\"? No.\n\nOK let me think really carefully. Is there ANY world capital spelled without a, e, i, o, u?\n\nLet me go through systematically by region:\n\nEurope: (list above) — none found.\n\nMiddle East & Central Asia:\n- Ankara, Cairo? (Africa), Tehran, Baghdad, Damascus, Beirut, Jerusalem, Amman, Riyadh, Kuwait City, Manama, Doha, Abu Dhabi, Muscat, Sanaa, Baku, Yerevan, Tbilisi, Ankara...\n\nWait, \"Abu Dhabi\"? a, u, a, i. No.\n\n- Ashgabat, Tashkent, Bishkek, Dushanbe, Astana, Kabul, Islamabad.\n\nHmm, none.\n\nAfrica: (list above) — none found. \n\nWait, \"Baku\"... Let me check \"Baku\"... No.\n\nHmm, \"Gaborone\", \"Windhoek\", \"Pretoria\" (South Africa has three capitals: Pretoria, Cape Town, Bloemfontein). All have vowels.\n\n\"Antananarivo\", \"Mogadishu\", \"Kampala\"? a, a, a. \"Nairobi\"? a, o, i. \"Khartoum\"? a, o, u. \"Bujumbura\"? u, u, u, a. \"Kigali\","
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