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Discussion of Problem 2043. Kirill the Gardener 2

wrong solution for example
Posted by Daniel Moldovan 20 Apr 2016 01:11
There are 21 steps in this sequence:

1, 2, 3, 4, 5, 6, out, 6, 7, 8, 9, 10, 11, 12, out, 12, 11, 12, 13, 14, 15