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Problem 4239
life and death

"On the third line 6 stones live, 4 stones die" says the proverb. But what about 5 stones? Can you make them live unconditionally? Many thanks to Tails for disproving the book's solution and providing a new one... though it took me ages to work it all out. Editing time for this problem alone: hundreds of hours (@revision#109)

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