# How to mark different bibliographies with different letters in amsrefs?

It seems that amsrefs strikes again! I'd like to have more than one bibliography, and in the first one, the entries should be marked, say, as [A1], [A2] etc., in the second, say, [B1], [B2] etc. and so on. I could use \BibLabel to modify the look of the entries in the bibliography, and modify \cite@somethings to modify the references, but this seems to be an ugly hack. Any better ideas?

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