ZarankiewiczDB,

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Matrix for z(11,31)

111111
111111
111111
111111
111111
111111
111111
111111
111111
1111111111
1111111111

Found by the scaffold algorithm.

(0.566195983 seconds, score = 74, 2441 recursive calls, max depth = 44)

lower bound = 74, submitted by Andrew Kay on April 22nd, 2016 (link, raw)