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"There are two ways to proceed: (a) look it up (b) work it out. To work it out we use the following stunt, which seems artificial if you haven't seen it before, but after using it 4993 times it will seem quite routine." — generatingfunctionology
Among Wilf's other accomplishments, he co-founded the Journal of Algorithms with Knuth, and convinced Doron Zeilberger to become a combinatorialist.
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