ZarankiewiczDB,

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Matrix for z(4,5 | 4,4)

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

Found by the quotient matrix algorithm.

(622562.032240404 seconds, score = 70, 11635275344 recursive calls, max depth = 20)

weight = 70, submitted by Andrew Kay on July 26th, 2016 (link, raw)