Many thanks
I cleaned up my K3 by
(1) Deleting all empty directories using a Windows Utility
(2) Reloading all the categories for K3 loaded books back into Calibre, clearing up a few mistakes and then updating the categories on the K3
(3) A few unwanted books appeard on the K3 which I then deleted on the Kindle
(4) I used the edit collections to delete the spurious entries.
Two entries are sticky and won't go - but I have identified them as being my two Dictionaries on the Kindle - they seem to have some special status.
Thanks again, and I hope this summary helps others.
I suspect, in the long-term, we need plugin whose job is to check database consistency on the K3 and between K3 and Calibre.
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