ZarankiewiczDB,

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z(21,24) = 110

11
11
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
111
111
11111
11111
11111
11111

Compare with Matrix 31.

Scaffold: $p=4$, $q=5$, $\mathbf{m} = (4,4,4,4)$, $\mathbf{n} = (4,4,4,2,2)$, $m_O=2$, $n_O=0$.

(135.594538166 seconds, score = 110, 748330 recursive calls, max depth = 22)

weight = 110, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

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