Hold away from learner fresh first capture. These are science contexts C19–C20, not staff-workflow counts. They are fictional source interpretation, never real worker/child results.
C19 · Fictional maker rehearsal, held teacher-side
For teacher preparation only, a different invented rehearsal uses a clean fabric mat that is loosely rolled and then unrolled. Its flat span is 6 units before and 6 after, with the rolled span unspecified. Solution: the final flat span equals the initial value; the intermediate measurement is unknown. The reported roll changed form, while the known material remained fabric. This rehearsal demonstrates how to accept missing data and record provenance; it is not the fresh E learner source and must not be supplied as a coached answer before E.
C20 · Repair kiosk message
Invented context for teacher preparation: a kiosk message says every cloth returns flat because one previous cloth did. Solution: a single source record can support what happened to that one piece and a cautious next prediction, not the universal claim. A better message names the record and asks whether another suitable comparable piece behaves similarly. If a real contributor is unavailable, keep the kiosk fictional; do not fabricate an interview. This contextual solution differs from fresh F's exact two-record source and must not coach it before collection.
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