Talk:1976 USAMO Problems/Problem 1

OK so we have a 4*7 rectangle, and I will do the columns left to right, top to bottom. b b w w b b w next row b w b w b w w next row b b b w b b w next row w b w w b w b end rectangle And in the two middle rows and the last four columns, the intersection is outlined. --1=2 13:24, 5 October 2008 (UTC)