You can do whatever you like. I wouldn't even listen to my mother on my challenge list let alone a giant robot on the Internet.
I rubbed off a book off the list that looked unavailable unless I spent more than $250 on a used copy, but then I found it re-released in a collection so put it back on. I had to switch a Kenazruo Oe book on my list from one to another for availability concerns as well. In future I should probably look more closely at availability prior to making my challenge list.
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