ZarankiewiczDB,

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Matrix for z(11,19)

11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111

Found by the scaffold algorithm.

(0.04150779 seconds, score = 55, 215 recursive calls, max depth = 26)

lower bound = 55, submitted by Andrew Kay on April 22nd, 2016 (link, raw)