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Discussion of Problem 1634. Spider Mite

sample
Posted by IgorKoval(from Pskov) 23 Jul 2012 04:28
How we get this?
После первого опрыскивания — 2, 4, 5, 1, 3.
После второго опрыскивания — 4, 1, 3, 2, 5.
После третьего опрыскивания — 1, 2, 5, 4, 3.
После четвёртого опрыскивания — 2, 4, 3, 1, 5.
После пятого опрыскивания — 4, 1, 5, 2, 3.
После шестого опрыскивания — 1, 2, 3, 4, 5.

I don't understand rule P. It's strange rule. =)