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Trivial example just to show the structure:
{190 10 ⍴⍵}{(⍳⍵)}1900
That "190" needs to be calculated as ⌈⍴⍵/10 or if there is a symbol to say "pack all elements into an R-wide array and let it have as many rows as needed". The {(⍳⍵)}1900 is just a stand in for an arbitrary code that will g...