{
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      "bytes": 85719,
      "media_type": "application/pdf",
      "name": "five-letter-word-classroom-pack-colour.pdf",
      "sha256": "c5129056c3eadefd1aa8c8b84ba3a2e6dfd903bccef5b16d687921bd40ccf0ad"
    },
    {
      "bytes": 85641,
      "media_type": "application/pdf",
      "name": "five-letter-word-classroom-pack-black-and-white.pdf",
      "sha256": "924e9abfbe5f55d32109ccea24f998a1f35cb9707ff102fb918ba70a127d1fed"
    }
  ],
  "generator": "scripts/generate_classroom_pack.py",
  "licence": {
    "definition_text": "CC-BY-SA-4.0 (Wiktionary contributors)",
    "original_lesson_and_layout": "CC-BY-4.0",
    "pronunciation_data": "BSD-2-Clause (CMU Pronouncing Dictionary)"
  },
  "method": {
    "cutoff": "Pack inputs frozen for 2026-08-30 release v1.",
    "definitions": "Eight fixed English Wiktionary definitions selected and lightly formatted; exact entry URLs travel in sources.definitions.entry_urls.",
    "frequency_pool": "The 400 highest-wordfreq safety-filtered entries in the site's Most common band (Zipf >= 4.0); counts record whether a letter occurs at least once in a word.",
    "pronunciation": "Three fixed rhyme groups whose rows are primary CMUdict entries and whose stress-stripped rhyme keys agree."
  },
  "released": "2026-08-30",
  "sources": {
    "definitions": {
      "adaptation": "Selected and lightly formatted; long entries may be shortened.",
      "entry_urls": {
        "dream": "https://en.wiktionary.org/wiki/dream#English",
        "heart": "https://en.wiktionary.org/wiki/heart#English",
        "house": "https://en.wiktionary.org/wiki/house#English",
        "music": "https://en.wiktionary.org/wiki/music#English",
        "night": "https://en.wiktionary.org/wiki/night#English",
        "place": "https://en.wiktionary.org/wiki/place#English",
        "river": "https://en.wiktionary.org/wiki/river#English",
        "think": "https://en.wiktionary.org/wiki/think#English"
      },
      "license": "CC BY-SA 4.0",
      "license_url": "https://creativecommons.org/licenses/by-sa/4.0/",
      "name": "English Wiktionary",
      "url": "https://en.wiktionary.org/"
    },
    "learner_levels": {
      "citation": "The CEFR-J Wordlist Version 1.5. Compiled by Yukio Tono, Tokyo University of Foreign Studies. Retrieved from http://www.cefr-j.org/download.html on 1/20/2020.",
      "commit": "d4e45b75b38f27b30dfc5c44d8c571aec7e7092f",
      "license": "Free for research and commercial use with citation; copyright Tono Laboratory at TUFS (Tokyo University of Foreign Studies).",
      "license_url": "https://github.com/openlanguageprofiles/olp-en-cefrj#terms-of-use",
      "name": "CEFR-J Vocabulary Profile (ver 1.5) via Open Language Profiles",
      "url": "https://github.com/openlanguageprofiles/olp-en-cefrj",
      "use_note": "Used by the accompanying classroom guide for optional leveling; not used to select the fixed pack's activities."
    },
    "phonetics": {
      "commit": "74790861f652b15e4ac49015a90074ad62a27690",
      "license": "BSD-2-Clause",
      "license_url": "https://github.com/cmusphinx/cmudict/blob/74790861f652b15e4ac49015a90074ad62a27690/LICENSE",
      "method": "Primary CMUdict pronunciations only for the fixed rhyme activity; stress marks are retained in the source artifact and rhyme keys strip stress.",
      "name": "CMU Pronouncing Dictionary (cmusphinx/cmudict)",
      "sha256": "81917843c7f44ce2b094ac63873c2c7a4cf802040792c455ba3ca406891c3d22",
      "url": "https://raw.githubusercontent.com/cmusphinx/cmudict/74790861f652b15e4ac49015a90074ad62a27690/cmudict.dict"
    },
    "safety_policy": "data/blocked_answer_words.txt",
    "word_frequency": {
      "license": "wordfreq data: CC BY-SA 4.0 (code: MIT)",
      "license_url": "https://creativecommons.org/licenses/by-sa/4.0/",
      "method": "wordfreq.zipf_frequency(word, 'en') rounded to 2 decimals; band from round thresholds derived from the observed distribution, with the intermediate/advanced boundary pinned to word_rarity.json's legacy threshold. Words unknown to wordfreq score 0.0 (known words floor at ~1.0), so zipf == 0.0 flags 'not in wordfreq'.",
      "name": "wordfreq (Robyn Speer)",
      "url": "https://github.com/rspeer/wordfreq",
      "version": "3.1.1"
    }
  },
  "title": "Five-letter words: vocabulary, sound and probability",
  "version": "v1"
}