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  • Thanks. I should add that I would prefer to keep the list structure since the elements at the highest level actually have a particular meaning. Commented Apr 8, 2019 at 0:20
  • The list structure is present in the grp column, so there's no loss of information. Rectangular data is easier to reason about compared to lists-of-lists, etc. Commented Apr 8, 2019 at 0:45
  • Yes, you could recover the list that way, but really I'm suggesting that you do not use lists at all. Just a suggestion. Commented Apr 8, 2019 at 3:01