Target/codes: revise own idea and propagate every changed decision to later copy while holding delay; partial AC9AMUFD01/FC01. Prepare: first/copy own score, broad replacements/exact words; invitation G.
- Welcome · 3 min. “Try another idea. Give B the same new choices.” Private/show/music-alone choice, silent or reviewed one-part/combined optional.
- Model · 4 min. Adult local idea 1,4 becomes 1,3. A shared 4 sound→wait/3 wait→sound; B shared 6 sound→wait/5 wait→sound. Initial B waits/A outer done/two-beat delay fixed. This is coordinated plan revision, not live proof.
- Try together · 5 min. Child spots one missing propagated change, directs exact restoration. Adult model away before own creation.
- Child choice · 7 min. Save own first version, revise one or more idea decisions and update matching B positions two places later. Read or try chosen parts/optional combination with fixed reviewed sources; prefer first/new/both.
- Notice · 4 min. Save all removed/added A/B choices and held mapping; count may change in open making. Actual timing/sound/receiver response separate.
- Close · 2 min. Child chooses version to keep/share; no physical model/fairness outcome or expected emotion inferred.