As long as you own aabbcc.com and have the domain name pointed to a server, you can continue to do the redirection in the server's configuration, without needing any content. However, I would not advise abandoning the domain name while you still have outside links pointing to it, because once you no longer control that domain you can no longer use redirection and will lose any benefit of those inbound links.

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The best way to learn anything, is to question everything.