How to clear and prevent multiple identical apps on "Open With"?

I understand why "Open With" includes both old and new versions of updated apps. Fine.
But how do I CLEAR the list and prevent this from continuing? (I'd expect it to offer a "Clear List" option at the bottom. It doesn't.)
Thank you.

Rebuild LaunchServices Database
Open the Terminal application in your Utilities folder.  At the prompt paste in the following command in its entirety:
     find /System/Library/Frameworks -type f -name "lsregister" -exec {} -kill -seed -r \;
Press RETURN.  Wait for the Terminal prompt to return after which you can quit the Terminal.

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