# H10 · Keep one useful idea

**Start:** Choose any actual retained page, or this complete original fictional note if none exists: named Moon below the window-centre mark at model time a, level with that same mark later at time b; same frame retained, source supplied fiction. Ask “What does this help someone do? What would we check next?” **Choices:** Short handover, paper guide or private dictated draft. **Notice:** Source/question/time/status travels with the message; no need a polished craft or all-ten completion. **Keep:** One supported finding and one precise next invitation. **Next:** Revisit only the missing distinction, not a full worksheet. No public sharing, school grade, physical observation or progress score inferred.

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