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ProblemsWu Wei Chao, Joaquin Gomez Rey, Stephen G. Penrice, Dennis Spellman, William P. Wardlaw, Emre Alkan, Michael Golomb, George T. Gilbert, Donald Knuth, Eugene Lee, John Christopher, Evgenii S. Freidkin, J. C. Binz, Jerrold W. Grossman, Barry Turett, William A. Newcomb and Murray S. Klamkin · Mathematics Magazine · 1999