ZarankiewiczDB,

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Matrix for z(3,3 | 3,3)

$I$$I$$\alpha$
$I$$\alpha$$I$
$\alpha$$I$$I$

$I$ is the identity and $\alpha$ is a 3-cycle. The $I$ entries form an extremal 3x3 rectangle-free matrix, showing that the finite projective plane of order 3 is sub-similar.

weight = 27, submitted by Andrew Kay on April 22nd, 2016 (link, raw)