ZarankiewiczDB,

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Matrix for z(12,16)

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

Found by the scaffold algorithm.

(0.175224225 seconds, score = 53, 1609 recursive calls, max depth = 19)

weight = 53, submitted by Andrew Kay on April 22nd, 2016 (link, raw)