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No, it's not his. I knew it when I was a child. And he lost play on words in back translation.

When did he write this book? I knew this joke long-long ago. I don't believe it's Pratchett's. I would think that a translator, being unable to translate Pratchett's joke with play on words, just...

Pioner, I think they won't get it. The joke is in play on words "Зимний/летний" without mentioning palace. If you add "palace" there, you'll spoil the joke.