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How am I supposed to do that, other than evaluating a variable for a for loop expression? Any ideas?

((n=$north; n>=1; n--))
is what $a is supposed to be. That way,
for ${a}
actually should be
for ((n=$north; n>=1; n--))
This function has to run multiple times in slightly different ways. Normal...

I'm writing a script to merge the xkcd webcomic tiles for comic 1110. So far, I have written about 100 lines, and instead of doing each quadrant of the image separately, I've decided to use functions...