ZarankiewiczDB,

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Matrix for z(11,33)

1111111
1111111
1111111
111111
111111
111111
111111
111111
111111
1111111111
1111111111

Found by the scaffold algorithm.

(4.558847283 seconds, score = 77, 17205 recursive calls, max depth = 47)

lower bound = 77, submitted by Andrew Kay on April 22nd, 2016 (link, raw)