ZarankiewiczDB,

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Matrix for z(9,32)

11111111
11111111
1111111
1111111
1111111
1111111
111111
11111111
11111111

Found by the scaffold algorithm.

(0.04210591 seconds, score = 66, 98 recursive calls, max depth = 40)

lower bound = 66, submitted by Andrew Kay on April 22nd, 2016 (link, raw)