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Mar 18, 2015 at 6:42 vote accept user43928
Mar 18, 2015 at 1:29 answer added Padraig Ó Catháin timeline score: 5
Mar 17, 2015 at 22:59 comment added Gerry Myerson For what it's worth, this can be done for the 7-point plane: $$\matrix{1&2&3&4&5&6&7\cr2&5&7&1&3&4&6\cr3&7&4&5&6&2&1\cr}$$
Mar 17, 2015 at 21:19 history asked user43928 CC BY-SA 3.0