ZarankiewiczDB,

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Matrix for z(12,28)

111111
111111
111111
111111
111111
111111
111111
111111
111111
1111111
1111111
1111111

Found by the scaffold algorithm.

(28.24843353 seconds, score = 75, 142062 recursive calls, max depth = 39)

lower bound = 75, submitted by Andrew Kay on April 22nd, 2016 (link, raw)