How to Remove duplicate entries in address book

After syncing with iCloud (three computers and a phone) suddenly I am seeing multiple entries for the same contact in the address book and multiple entries in the calendars for the same event. Can anyone suggest how to stop this and how to delete the multiple entries without having to manually delete each item? The new Address book does noit seem to have a list view that shows the entire address book 9only shows addresses with two or three alphabets...

Is there a setting to prevent this from happening? I had similar experiences with the old Mobile.me and was hoping the problem had been fixed.

The value of iCloud is lessened when these issues crop up and there seems to be no defined method to fix the problem. I see numerous entries on the Support Community boards with the same problem.

Any suggestions? Thank you.