C13 · Mismatched labels · ordinary Day 17
Complete source: C13 fictional RED sign and BLUE tray refer to same drawn tray. Intended name absent.
Ordinary educator example — after an own attempt
Worked reasoning after own attempt: Ask intended label, then revise paper consistently. May help finding, but no public sign changed.
Limit/next check: BLUE not automatically right; public alteration not authorised.