two-bin system
C1CEFR level
85/100Rarity: very rare
TechnicalRegister
A replenishment method where drawing down a reserve bin triggers reordering once the first empties.
The two-bin system on fasteners means a floor tech flips a card the moment one bin runs dry.
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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