MECE
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
Describing a set of categories that are mutually exclusive and collectively exhaustive, so nothing overlaps and nothing is left out.
Before we present the cost drivers, let's make sure the buckets are genuinely MECE.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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