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Retroactive discount on C# 6.0 In a Nutshell (registered C# 5.0 a day after purchasing #6 without realizing there was a discount)


I didn't realize that by owning a previous version of a book that I could get up to 50% off of the upgraded edition. Can I retroactively get a partial refund of my online purchase of C# 6.0 In a Nutshell now that I've registered my C# 5.0 in a nutshell printed edition?
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