C16 · An approved kit note · ordinary Day 18
Complete source: C16 model says return flat cards to CARD TRAY after use. Actual kit/tray availability absent.
Ordinary educator example — after an own attempt
Worked reasoning after own attempt: If adult approves available tray, inspect whether note names it. Otherwise use drawn tray, labelled model.
Limit/next check: No unobserved return, presumed equipment or public adoption.