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You can't get all of them at once. That's abusive to the server.

Scripts can read in bulk with limit=n&page=m. "limit=1000&page=2" will return posts 1001-2000.

If you're writing a script, the most efficient way to do it is to store the highest post ID you know about. Then, send the query "tags=id>N order:id holds:true", where N is your current highest post, to get the next batch of newer posts.