ZarankiewiczDB,

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Matrix for z(13,32)

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

Found by the scaffold algorithm.

(7568.752540896 seconds, score = 87, 37564376 recursive calls, max depth = 48)

lower bound = 87, submitted by Andrew Kay on April 23rd, 2016 (link, raw)