Base Difficulty

Base difficulty: Level 18 edit

Level distribution for preposition (preposition_other): 6: 10 10: 7 11: 8 14: 1 18: 4 23: 2 226: 5 1080: 1 1120: 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: 799 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cambridge_yle Movers (2 of 3) 750
cefr A1 (1 of 6) 800

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 96.84 790 80% 987 downrated 1
20th_books 110.22 729 80% 911 downrated 1
wiki_math 309.51 360 80% 450 downrated 1
wiki_geography 212.33 461 80% 576 downrated 1
wiki_biology 241.02 398 80% 497 downrated 1
wiki_modern_life 205.59 458 80% 572 downrated 1
wiki_arts 138.76 747 80% 934 downrated 1
wiki_society 94.37 1171 80% 1464 downrated 1
wiki_linguistics 384.79 251 80% 314 downrated 1
wiki_physical_science 380.53 255 80% 319 downrated 1
wiki_history 48.40 2253 80% 2816 downrated 1
early_modern_science 146.41 595 80% 744 downrated 1
religious_translated 63.33 1308 80% 1635 downrated 1
cooking 73.92 1206 80% 1507 downrated 1
legal_scotus 213.40 465 80% 581 downrated 1
eu_parliament_debates 30.85 2467 80% 3084 downrated 1
openstax_science 238.06 429 80% 536 downrated 1
openstax_society 149.47 760 80% 950 downrated 1
wpa_life_histories 63.10 1245 80% 1556 downrated 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.