1. If I have a M-by-N table with entries like this (you may recognise
the example ;)...

...
{.  curlylfdot
{:  curlylfco
{:: curlylfcoco
}   curlyrt
...

how do I neatly slice off the first 3 columns (say) into a boxed list
of tally M to serve as a lookup index?
Ditto any given field, i.e. set of columns?
I'm often doing it, but a different way each time, and the methods I
use are cumbersome.

2. Is there already a slice'n'dice cookbook on the wiki, to give quick
answers to questions like this?

Ian
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