I was having trouble producing the top data programtically (x by x matrix with each element being an empty list) using reshape and eventually gave up and used a nested mapping
Is there a way of using reshape to do the job or does it need a slight tweak to deal with empty lists?
Probably you can, just ringify the list block, then wrap the entire script with call. It creates a 3×3 matrix with each element being an empty list. Is that what you mean?
That does the job - hopefully I'll remember to use it next time I need to do this sort of thing 
Ooooh, that's an awesome hack, kudos!
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