ZarankiewiczDB,

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Matrix for z(14,19)

1111
1111
1111
1111
111
111
1111
1111
111
111
1111
1111
111
111
111
111
1111
1111
1111

Found by the scaffold algorithm.

(2.298958667 seconds, score = 68, 12991 recursive calls, max depth = 20)

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