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Eta 2011

Start date: May 27, 2011, midnight UTC
Check whether a given sequence is a valid traversal of some ternary undirected tree.

Stats:

1558 started 33 silver awards 24 golden awards

Hall of fame:

1
Lazni Mail
Time: 21 hours, 17 minutes
2
Mario Zivic
Time: 21 hours, 25 minutes
3
Davor Sutic
Time: 1 day, 15 hours