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Awk, in this case, particularly, gawk, has supported multidimensional arrays for a long time. On linux, 'awk' is usually 'gawk', so the distinction isn't important.

You can see one manual entry...

I have awk appearing to behave inconsistently. With the same variable it will give the message:

fatal: attempt to use array `X["2"]' in a scalar context

and, if I try to correct that, then:
...