Are you familiar with the different ways of managing collections on the Kindle? There are a number of different ways to do it. The "slow" way is to select a book, then "Add to Collection", and choose which collections you want to add it to. That's rather painful for a lot of books. A much faster way is to open the collection, select "Add/Remove Items", and then choose which books you want to add or remove. That's enormously faster.
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