ZarankiewiczDB,

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z(12,21) = 63

111111
11111
11111
11111
11111
11111
11111
11111
11111
11111
111111
111111

Found by the scaffold algorithm.

(0.203132242 seconds, score = 63, 1474 recursive calls, max depth = 29)

weight = 63, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

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