The following files contain pairs of projective planes
of order 16 sharing a maximal (52,4)-arc.
The Johnson plane and the Johnson-Walker plane
The Johnson plane and the plane BBH1
The Lorimer-Rahilly plane LMRH and its dual plane
The following files contain new maximal (52,4)-arcs found
by Mustafa Gezek in the Johnson plane and the Mathon plane.
New arcs in the Johnson plane
New arcs in the Mathon plane
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