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SUBMIT YOUR IDEAI went with 2 multi-row formulas as many others did.
Ended up with slightly different syntax, but similar effect.
I spent some time looking for a function similar to Excel's TEXT to convert the "J, F, M..." to "Jan, Feb, Mar, ..." but eventually settled on a lengthy IF statement, which seems to be the common strategy. Some of the other solutions are interesting, and good examples of other ways to think about the problem.
My solution:
My solution: