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It does not use an official Wordle list."]}],"output_license":"No reuse licence asserted; source-rights review pending","output_license_url":"/about/data","population_sha256":"a88b07cbfba527bd92aa7633fda3d34110aefcead8b8a8be151ea089cdcd249e","publication_status":"published","related_searches":[{"label":"Explore spelling constraints","relevance":"Refine a length and positional pattern in the main query tool.","url":"/words"}],"reproducibility_command":"make studies_reproduce STUDY=letter-frequency","research_question":"How do letter distributions change by spelling position, length, and frequency-tier cohort in this release?","review":{"approved_analysis_contract_digest":"2a18981b7cbf3892c37e77ccfef9616808a51b584ed9b9b69d52245dcad53f20","approved_content_artifact_digest":"477542693badcafd96a49a013917cb986d413ee48d738561b13d04fa8f330416","approved_content_version":"1.0.1","approved_data_version":"2026.07-lexical.6","approved_lexical_build_id":"647a998abcbf65af6a16c86cb8460cb4a88761a94544468e9c9e992208fc327c","approved_result_sha256":"1de9c48c4d05f3fed17263051087969627c1d8fd3741deae675df1c1304ef918","editorial_approval":"TWI-v1.4.0-editorial-review-2026-08-02-r1","editorial_status":"approved","factual_approval":null,"factual_status":"machine-validated","legal_approval":null,"legal_status":"pending","reevaluate_on":"2026-10-13","reviewed_at":"2026-08-02","reviewer":"Matthew Iles","search_approval":null,"search_eligibility_reason":"Computed tables remain noindex pending source-rights review and separate search approval.","search_eligible":false},"schema_version":1,"slug":"letter-frequency","sources":[{"artifact_sha256":"3ed0c94610d8bcf7c11bbb49c56aa49c7234d32b66824df91f554169e572da48","attribution":"dwyl/english-words; the repository carries an Unlicense notice, while its pinned README attributes upstream copyright to Infochimps","establishes":["source-membership","surface-spelling-as-listed"],"legal_review_status":"pending","licence_name":"Unlicense notice; upstream dataset rights unresolved","licence_url":"https://raw.githubusercontent.com/dwyl/english-words/8179fe68775df3f553ef19520db065228e65d1d3/LICENSE.md","limitations":["The pinned repository licence is the Unlicense, but the pinned README says copyright in the extracted source list remains with Infochimps. Human legal review of the upstream rights chain is required.","Do not assert a redistribution right until the Infochimps-to-dwyl rights chain has been reviewed by a human.","Dialect or scope: unspecified"],"redistribution_status":"pending","source_class":"broad-orthographic-list","source_id":"dwyl-english-words","source_version":"git:8179fe68775df3f553ef19520db065228e65d1d3","url":"https://raw.githubusercontent.com/dwyl/english-words/8179fe68775df3f553ef19520db065228e65d1d3/words_alpha.txt"},{"artifact_sha256":"d3fbe8485022088fcf527edcde2fbdc18b4bbc141ac58123c9adb462e086eaf7","attribution":"ENABLE (Enhanced North American Benchmark Lexicon); exact reuse terms are pending legal review","establishes":["source-membership","surface-spelling-as-listed"],"legal_review_status":"pending","licence_name":"Licence terms not stated by the source","licence_url":"https://www.wordgamedictionary.com/enable/","limitations":["The downloaded artifact is content-pinned by SHA-256, but it contains no licence notice and the configured source page does not state reuse terms.","The artifact is reproducibly pinned but no affirmative reuse grant has been located; redistribution approval remains pending.","Dialect or scope: North-American-oriented; exact edition metadata unavailable"],"redistribution_status":"pending","source_class":"historical-game-word-list","source_id":"enable","source_version":"artifact-sha256:d3fbe8485022088fcf527edcde2fbdc18b4bbc141ac58123c9adb462e086eaf7","url":"https://www.wordgamedictionary.com/enable/download/enable.txt"},{"artifact_sha256":"ee2d83651fbb91642bbed2bd30ead404c2cfbdfece01dacf284af6ea47795811","attribution":"first20hours/google-10000-english, derived from the Google Web Trillion Word Corpus and Peter Norvig's compilation","establishes":["source-membership","source-order"],"legal_review_status":"pending","licence_name":"No explicit licence grant in pinned repository metadata","licence_url":"https://raw.githubusercontent.com/first20hours/google-10000-english/bdf4c221bc120b0b7f6c3f1eff1cc1abb975f8d8/LICENSE.md","limitations":["The exact pinned LICENSE.md describes provenance but contains no explicit public-domain dedication or licence grant. Human review is required.","The pinned repository documents provenance but does not supply an affirmative licence grant; do not describe it as public domain.","Dialect or scope: USA no-swears variant"],"redistribution_status":"pending","source_class":"ranked-web-corpus-derived-list","source_id":"google-10000-english","source_version":"git:bdf4c221bc120b0b7f6c3f1eff1cc1abb975f8d8","url":"https://raw.githubusercontent.com/first20hours/google-10000-english/bdf4c221bc120b0b7f6c3f1eff1cc1abb975f8d8/google-10000-english-usa-no-swears.txt"},{"artifact_sha256":"5351ff405b1126ef555791dd4d9798a48e3e9a501a9fc481a9da957752cfb458","attribution":"FrequencyWords content derived from OpenSubtitles, licensed CC BY-SA 4.0","establishes":["source-token-observation","source-token-count"],"legal_review_status":"pending","licence_name":"CC BY-SA 4.0 (content)","licence_url":"https://raw.githubusercontent.com/hermitdave/FrequencyWords/525f9b560de45753a5ea01069454e72e9aa541c6/README.md","limitations":["The exact pinned README states MIT for code and CC BY-SA 4.0 for content. Human review is required for attribution and ShareAlike obligations on compiled and derived data.","Content is declared CC BY-SA 4.0. Attribution and ShareAlike treatment of the compiled frequency evidence and derived tiers require human approval.","Dialect or scope: unspecified"],"redistribution_status":"pending","source_class":"subtitle-derived-token-frequency","source_id":"frequencywords-en-2018","source_version":"git:525f9b560de45753a5ea01069454e72e9aa541c6; corpus-release:2018","url":"https://raw.githubusercontent.com/hermitdave/FrequencyWords/525f9b560de45753a5ea01069454e72e9aa541c6/content/2018/en/en_50k.txt"},{"artifact_sha256":"ef70bc128a3ae67c23c5a4e31ec6b0ef3780e94881faa3adf9b73c2f7f684b4d","attribution":"The Word Index first-party content-safety exclusion policy","establishes":["content_filter","search_results","result_counts"],"legal_review_status":"pending","licence_name":"Reuse terms not yet approved","licence_url":null,"limitations":["This bounded policy list cannot determine whether every usage is offensive or benign."],"redistribution_status":"pending","source_class":"first-party-content-safety-policy","source_id":"offensive-term-policy","source_version":"2026.07-review-pending.2","url":"/about/data"}],"study_build_id":"709a447933fc5803d9882945c4db79b14ac68f1912d9ad68537c55134611d070","study_id":"study.letter-frequency","study_version":"1.0.1","tables":[{"caption":"The exact population used by this version of the analysis.","column_ids":["stage","record_count"],"dataset_id":"study.letter-frequency.population","heading":"Population and exclusions","note":null,"row_ids":["raw","policy-excluded","safe","analysis"],"table_id":"study.letter-frequency.population-table"},{"caption":"The two declared ranking cohorts use the same deterministic tie-break.","column_ids":["cohort","length","position_leaders","record_count"],"dataset_id":"study.letter-frequency.leader-sequences","heading":"Position-leading sequences for 7-letter spellings","note":null,"row_ids":["all-tiers-length-7","tiers-1-2-length-7"],"table_id":"study.letter-frequency.sequence-table"},{"caption":"Leaders are based on exact aggregate counts; alphabetical order breaks ties.","column_ids":["position","all_leading_letter","all_letter_count","all_record_count","all_share_percent","higher_leading_letter","higher_letter_count","higher_record_count","higher_share_percent"],"dataset_id":"study.letter-frequency.length-7-comparison","heading":"The leading letter at each 7-letter position","note":null,"row_ids":["length-7-position-1","length-7-position-2","length-7-position-3","length-7-position-4","length-7-position-5","length-7-position-6","length-7-position-7"],"table_id":"study.letter-frequency.leader-table"}],"title":"Letter positions by spelling length and frequency tier","transformation_steps":[{"description":"Enumerate one-indexed character positions and aggregate exact letters separately by length and tier cohort.","deterministic":true,"limitations":["Normalized ASCII letters do not represent graphemes in every orthography."],"transformation_id":"letter-frequency.position-v1"}],"update_history":[{"data_version":"2026.07-lexical.3","effective_date":"2026-07-15","result_sha256":"0fe085b5886ac5185f9c48bda65e724b2df20c289b32f0943913bdd329eb9a33","review_status":"machine-validated","reviewer":null,"study_version":"1.0.0","summary":"Initial reproducible positional analysis."},{"data_version":"2026.07-lexical.4","effective_date":"2026-07-18","result_sha256":"0fe085b5886ac5185f9c48bda65e724b2df20c289b32f0943913bdd329eb9a33","review_status":"machine-validated","reviewer":null,"study_version":"1.0.0","summary":"Rebound byte-identical results to the 2026.07-lexical.4 data release; no numeric changes."},{"data_version":"2026.07-lexical.5","effective_date":"2026-07-25","result_sha256":"0fe085b5886ac5185f9c48bda65e724b2df20c289b32f0943913bdd329eb9a33","review_status":"machine-validated","reviewer":null,"study_version":"1.0.0","summary":"Rebound byte-identical results to the 2026.07-lexical.5 data release; no numeric changes."},{"data_version":"2026.07-lexical.6","effective_date":"2026-07-26","result_sha256":"0fe085b5886ac5185f9c48bda65e724b2df20c289b32f0943913bdd329eb9a33","review_status":"machine-validated","reviewer":null,"study_version":"1.0.0","summary":"Rebound byte-identical results to the 2026.07-lexical.6 data release; no numeric changes."},{"data_version":"2026.07-lexical.6","effective_date":"2026-08-01","result_sha256":"1de9c48c4d05f3fed17263051087969627c1d8fd3741deae675df1c1304ef918","review_status":"machine-validated","reviewer":null,"study_version":"1.0.1","summary":"Reframed tier 1-2 as a build-specific higher-ranked cohort rather than a familiarity claim."}],"user_relevance":"The study distinguishes patterns in the broad five-tier cohort from patterns in its higher-ranked tier 1-2 cohort."}