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apply it, and searches continue to work just fine for MARC21.

Unfortunately, as soon as I modify the 650 to be 650az, I run into a problem. 
The facet displays properly, but if I try to use it, I get no results.  This is
because, for now, Zebra does not allow multiple subfields to be concatenated
and thrown into a single index.  Searching for "su-to: Cookery -- Pennsylvania"
will return nothing, even if that heading is plentiful in the catalog. 
Currently, the only way to get to that heading would be "su-to: Cookery AND
su-to: Pennsylvania", or to use the linked authority record in subfield 9

I believe that this will mean that UNIMARC 700ab searching will fail; the
author name will not be coordinated in the index.  Unfortunately, I have no
UNIMARC data to test locally, and the two demo sites in UNIMARC (BibLibre and
Tamil) are not returning usable results.

Can a UNIMARC library test this, and verify if it works?  I don't think it
will, but if it does, then there is something golden in the UNIMARC
biblios/record.abs that I must steal for MARC21!

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