Removing matching items from a list?

[kevin4fong at gmail.com]

On Saturday, August 3, 2013 5:36:42 PM UTC-7, kevin... at gmail.com wrote:
> I have no idea why but I'm unable to post in my original thread so I made a new one here.
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> Thank you for the advice, everyone, especially Steven. It was really helpful with the descriptions and steps.
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> Would you also happen to know how I could set up a list that keeps track of the removed sets?
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> Let's say there's 4 a's taken out. The list would show:
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> ['a']
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> But if there was also 4 j's in addition to the 4 a's, it would go:
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> ['a', 'j']
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> and so forth.

Sorry for the repeated messages. I have no idea why I have such a long time delay. My messages didn't appear until just now after a few minutes (thought I was having some issues).