My book (Head first c#, 3rd edition) stops at page 807; an continues at page 1027, the index. It appears the appendix i 'leftovers' is missing.
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I'm sorry to hear that appendix is missing from your book. I see
that you have an oreilly.com account with the print book registered,
so I went ahead and added the ebook version to your account.
That has the missing appendix included in it. Just go to the Your
Products page of your account to download it.
I hope that helps,
O'Reilly Customer Service