Natural datastructure for 2-D or more freely accessible array of characters

Help!
2

arg/3 and setarg/3 :thinking:

I know it sounds crazy.

See my personal notes here. While not specifically about arg/3 it does give some useful details.

Also see the code that the notes are for in this post.

While I have not used these there are a few SWI-Prolog packs for matrix, e.g.

Pack matrix

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