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There is lots of redundant information stored in memory, e.g FILENAME is stored very often.
I would go for the following, and adapt the END section accordingly:

{
for (i=1; i<=NF; i++)...

awk arrays don't really work that way. awk arrays really aren't arrays at all -- a "2d array" is really just a 1d array with both indexes squashed together as a string.

So you certainly can't get...