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Aug 15, 2010 at 12:00 comment added user8140 I think that we could just do the greedy algorithm on choosing `$e_n, then e_n−1, and so on, until to e_6, then choose e_6,...,e_1 by hand.$'
Aug 15, 2010 at 11:52 vote accept user8140
Aug 15, 2010 at 11:47 comment added user8140 please read Mariano Suárez-Alvarez's comment! when M(n−1)=0, then it must be M(n)=2 – a-boy 0 secs ago
Aug 15, 2010 at 11:30 vote accept user8140
Aug 15, 2010 at 11:50
Aug 13, 2010 at 9:22 history answered dvitek CC BY-SA 2.5