ZarankiewiczDB,

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z(17,23) = 89

1111
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11111

Scaffold: $p=4$, $q=4$, $\mathbf{m}=(4,4,4,4)$, $\mathbf{n}=(3,3,3,3)$, $m_O=0$, $n_O=2$.

(988.68024704 seconds, score = 89, 13236293 recursive calls, max depth = 24)

weight = 89, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

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