ZarankiewiczDB,

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Matrix for z(12,24)

111111
111111
111111
111111
11111
111111
11111
11111
11111
111111
111111
111111

Found by the scaffold algorithm.

(12.694946983 seconds, score = 68, 80109 recursive calls, max depth = 33)

lower bound = 68, submitted by Andrew Kay on April 22nd, 2016 (link, raw)