Goal: represent a three-position repeating unit in sound/mark forms. Proposed code: AC9MFA01. Prepare: P2, Card 143; audio optional, never required.
- Listen/see · 3 min. Show or state P2 once: tap, tap, rest, tap, tap, rest. Provide a visual/tactile pulse simultaneously if needed.
- Model · 4 min. Place two TAP tokens and one thick REST bar in a three-cell frame; move frame to next cycle.
- Guide · 5 min. Child aligns first six symbols on the printed row or tactile strip, then marks the next three as a complete unit.
- Independent translate · 7 min. Child chooses quiet drum, desk-free visual flash or paper show, and gives the same order in a second medium without needing to make sound.
- Check · 4 min. Present tap, rest, tap; ask whether it preserves P2's unit and where the mismatch begins.
- Exit · 2 min. Child names all three positions. If rest is omitted, give it a thick tactile/blank-space marker tomorrow.