Problem-Solution: Help! I'm seeing my iCloud account two or more times in Notes and Contacts!

Question

Problem: Help! I’m seeing my iCloud account two or more times in Notes and Contacts!
Solution:
Open [System Preferences] >
Open [iCloud] >
Uncheck [Contacts] for each duplicate iCloud you see in Contacts. ex. My iCloud Account is listed three times = uncheck Contacts twice. The checkbox next to Contacts will fill back in again automatically.
Uncheck [Notes] for each duplicate iCloud account you see in Notes. (same instructions for Contacts; repeat the steps for each duplicate account)
Why is this happening?
It has to do with iCloud Keychain. If you set up iCloud keychain on more than one Mac, it appears to duplicate the iCloud account in each respective application once per Mac. (ex. 2 Macs = 1 Duplicate). The good news is that the above fix appears to be permanent and does not reoccur.

Answer 1

Minor addition:
I’m setting up a new Mac—how can I avoid this?
Turn on iCloud in System Preferences (SP)
When asked if you wish to set up Mail, Contacts, Calendar, Find my Mac, et al., uncheck all boxes, and click Next.
Check the “Keychain” box first, then check all other boxes except Contacts and Notes.
Within a few minutes, these boxes will check themselves.