Base Difficulty

Base difficulty: Level 304 edit

Level distribution for conjunction (conjunction_other): 6: 4 9: 4 10: 1 11: 2 304: 4 1399: 1

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 353 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Extended (2 of 2) 1600
cefr B1 (3 of 6) 4200

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 291.15 355 100% 355 1
20th_books 230.53 458 100% 458 1
wiki_math 367.25 385 100% 385 1
wiki_geography 61.63 2288 100% 2288 1
wiki_biology 196.28 679 100% 679 1
wiki_modern_life 189.14 699 100% 699 1
wiki_arts 193.27 666 100% 666 1
wiki_society 376.16 288 100% 288 1
wiki_linguistics 334.28 382 100% 382 1
wiki_physical_science 200.81 712 100% 712 1
wiki_history 173.73 739 100% 739 1
early_modern_science 518.65 200 100% 200 1
religious_translated 323.25 339 100% 339 1
cooking 74.37 1392 100% 1392 1
legal_scotus 2025.67 46 100% 46 1
eu_parliament_debates 546.72 229 100% 229 1
openstax_science 278.87 483 100% 483 1
openstax_society 527.87 212 100% 212 1
wpa_life_histories 99.27 1023 100% 1023 1

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.