[u238110]

So, there's another issue. I didn't realize that when doing the even numbered pages that they'd be "end to start." In other words, the odd numbered pages are beginning of the book to end, but then I flipped the stack of pages over to do the even pages and so the first scan is the last page of the book and the last scan is the first page of the book. So I need to reverse the order of the even numbered batch of pages before doing the interspersing process.