ZarankiewiczDB,

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Matrix for z(10,31)

111111111
111111
111111
111111
111111
111111
111111
111111
111111111
111111111

Found by the scaffold algorithm.

(0.07396359 seconds, score = 69, 235 recursive calls, max depth = 41)

lower bound = 69, submitted by Andrew Kay on April 22nd, 2016 (link, raw)