I have 3 iOS devices and  2 OSX (High Sierra) desktops and all share the 
address book.   Following some recent family messaging mixups due to sharing 
information on single cards rather than having separate cards  (this is 
historical) I set about a clean up doing my operations on one or other of the 
two OSX machines.  This has proceeded fine apart from the fact that on my 
MacAir I now have four copies of each card.   I have not a clue why!  The 
“master” information held in the cloud  is fine.   I suspect the way is to 
reinstall OSX, maybe from the Recovery sector.  
All advice welcome
Severin Crisp - in quadruplicate
____________________________________________________

             Assoc Prof R Severin Crisp, FAIP, FIP, CPhys
15 Thomas St, Mount Clarence, Albany, 6330, Western Australia
                  ph (08) 9842 1950 ( Int'l +61 8 9842 1950)
        Mob 0484 624 741   mail  to: sevcr...@westnet.com.au 
<mailto:sevcr...@westnet.com.au>
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