ZarankiewiczDB,

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Matrix for z(15,24)

111111
111111
111111
111111
11111
111111
11111
11111
11111
11111
11111
11111
11111
11111
1111111

Found by manually adding a column of weight 2 to Matrix 221.

lower bound = 82, submitted by Andrew Kay on April 23rd, 2016 (link, raw)