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Another S4 still life of the same size is this one I do not have the name for:
...OO.. .OOO.O. O....O. OO...OO .O....O .O.OOO. ..OO...
It probably deserves an article, as I believe it is also the smallest still life partitionable into pentominoes. --Tropylium 10:27, 18 August 2011 (CDT)