ZarankiewiczDB,

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Matrix for z(15,19)

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

Found by the scaffold algorithm.

(0.21782992 seconds, score = 72, 1339 recursive calls, max depth = 20)

lower bound = 72, submitted by Andrew Kay on April 22nd, 2016 (link, raw)