The Koolen-Riebeek, Soicher, and affine-geometry incidence graphs on 486 vertices are all realized by the same rank-9 action of 3^5:(2×M10), unified via the ternary Golay code.
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On the 486-vertex distance-regular graphs of Koolen--Riebeek and Soicher
The Koolen-Riebeek, Soicher, and affine-geometry incidence graphs on 486 vertices are all realized by the same rank-9 action of 3^5:(2×M10), unified via the ternary Golay code.