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Weirdly specific problem! So if I want to indicate an item is the second of three items in very, very, very short form I can write 2/3

But, in my situation, I'm using 0-based indexing so it's actually 1/3 but that means the last item is 2/3 and that makes no sense.

So, x/y is a bad format here. But, what's a good very short format that shows an item's index and the array's length?

I do not want to change what the numbers are, so it has to be the format that presents them that's adjusted.