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Matrix for z(7,7 | Δ_2 ∪ {O})

111222
122112
122211
212121
122121
221121
212112

Found by hand; matches the upper bound given by z(7,7)${} \cdot 2$.

weight = 42, submitted by Andrew Kay on April 26th, 2016 (link, raw)

Related: Matrix 2172