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Goal: state one visible-feature rule, sort only viewed samples under it and retain an item whose material differs. Proposed codes: AC9SFU03 (actual if observed), AC9SFI03, AC9SFI05. Prepare: genuine Day 133 log if any or Model L, one-property sort, Card 134.
Source · 3 min. Keep actual dated sample record and L MODEL in separate piles; no invented result fills a gap.
Rule · 4 min. State “visibly ribbed in this view / no visible ribs in this view”; place NOT VIEWED/UNCLEAR aside.
Model · 5 min. In L only, B and C both have reported ribs, but the maker reports fabric for B and paper-based card for C.
Child try · 7 min. Card 134 routes sort their actual viewed samples if available, or L's reported model features, and name a source-based counterexample.
Probe · 4 min. Ask whether “ribbed means fabric” still works with L's C or a genuine counterexample; record the child's revised rule.
Exit · 2 min. Save rule, raw placements, NOT VIEWED and source label; no universal claim.
