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Advanced Problems: 5490-5499J. T. Darwin, Jr., Roy O. Davies, Roy Buckley, S. B. Akers, R. D. Berlin, H. S. Shapiro, Jozsef Denes, Raisz Klara, Erwin Just, R. H. Shudde, E. S. Langford, Peter Yff, J. A. Hildebrandt, D. E. Daykin, Kuala Lumpur and J. S. Biggerstaff · The American Mathematical Monthly · 1967