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https://digipres.club/system/media_attachments/files/113/728/040/211/009/607/original/00bb7e14570ffca7.png
Which makes sense if we look at the map included in the box:
It's a 6x6 grid, labeled A-F, 1-6.
So clearly the game is storing map chunks in these .ARE files and loading them as needed.
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