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* He used to pay a finder ’ s fee of $ 2. 56 for any typographical errors or mistakes discovered in his books, because " 256 pennies is one hexadecimal dollar ", and $ 0. 32 for " valuable suggestions ".
According to an article in the Massachusetts Institute of Technology's Technology Review, these Knuth reward checks are " among computerdom's most prized trophies ".
Knuth had to stop sending real checks in 2008 due to bank fraud, and instead now gives each error finder a " certificate of deposit " from a publicly listed balance in his fictitious " Bank of San Serriffe ".

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