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Indexing Commands - @3@@INDEXSECONDARY@1.

The primary entry is sorted as if it had
appeared in an @3@@INDEX@1 command, and secondary
entries for a given primary entry are sorted
under that primary entry, eg:

@3@@INDEXSECONDARY(PRIMARY="Facecodes",
     SECONDARY="Small capitals")@1

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R.HARE, TRAINING GROUP, ERCC, 59 GEORGE SQUARE. SCRIBE 3 SLIDE 39.
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