ZarankiewiczDB,

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Matrix for z(10,18)

11111
11111
11111
11111
11111
11111
1111
11111
11111
11111

Found by the scaffold algorithm.

(0.080443185 seconds, score = 49, 516 recursive calls, max depth = 21)

lower bound = 49, submitted by Andrew Kay on April 22nd, 2016 (link, raw)