SKU
B2CEFR level
65/100Rarity: rare
TechnicalRegister
A stock-keeping unit, the unique code identifying a specific product variant for inventory tracking.
We've rationalised the range from four hundred SKUs down to just under a hundred.
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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