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This one definitely does not seem worth publishing. Every one knows that letters can be used to designate pieces, and no one would be interested to use letters for it that virtually no one has on his keyboard. It is also very unlikely that the this particular set of pieces (or a subset thereof) would have to appear in the same variant, and none other. And even when they do, whether the variant designer would use those under the same name, so that the IDs would make sense.