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The array-language landscape, while fascinating, is confusing to no end. Is there a reason to pick one of J or K or APL or A? None of these options seem to be open-sourced -- are there open sourced versions? I would love the expand my mind, but I remain befuddled.
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While A+ appears to (sadly) be a dead project, there's a new open-source APL interpreter: GNU APL.