In our production development environment, we perform a lot of data 
transfers between diverse systems, and most of those transfers involve 
comma-delimited (.csv) data. So my first small Clojure applications have 
revolved around the clojure-csv library. 

While learning Clojure I have seen the comment that using nth "stinks", 
because it creates dependencies. Wanting to do things in a Clojure way, I 
have a question.

If I need to extract a number of columns of a spreadsheet to minimize the 
dataset and this happens as the application is reading in and initializing 
its data, what should I use to extract those columns other than nth? And, 
if I use a series first and rest, isn't that also positional?

I've thought of ways to re-position the data initially, so comparison 
columns between two different spreadsheets that have one unique key column 
in common would be accessible with first, for example. However, I would 
still need to get at that data by column in order to reposition it, hence 
the need for nth.


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