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| One final note: apparently one needs to keep things "low-level" with `CellGroupData[]`, but also, for the groupings to work, it needs to be fed back into `NotebookWrite[]` and *not* `CellPrint[]`. |
| Kuba, thank you. ([Here][1] is the SE discussion.) [1]: https://mathematica.stackexchange.com/questions/167448/cellgroup-in-current-notebook |