Goal: identify a break in a stated two-part rule and repair it. Proposed code: AC9MFA01. Prepare: P4, P1, Card 142.
- Retrieve · 3 min. Child builds circle–square twice from mixed cards; adult does not point to the next position.
- Model · 4 min. State P4's intended circle–square rule and place a unit frame over positions 1–2, then 3–4; pause at mismatch.
- Guide · 5 min. Child locates the fourth card and chooses replacement; an adult can move it by child direction.
- Independent try · 7 min. In a bookmark, garden sign or model-fence context, child builds a new two-unit row with one deliberate break for an adult to find.
- Check · 4 min. Ask child to explain why a different later card is not enough to fix the original fourth-position break. Check two full units.
- Exit · 2 min. Child names or points to the repeated pair. If only appearance is copied, reduce to four positions tomorrow.