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A Square Game: 10696Gerald Heuer, Kenneth F. Andersen, P. Fitzsimmons, K. Heuer, S. S. Kim, J. H. Lindsey II, O. P. Lossers, K. Poelladennou, K. Schiling, L. Scribani, P. Simeonov, GCHQ Problems Group and NSA Problems Group · The American Mathematical Monthly · 2000