#N five-margolus-media.rle
#O Connor Steppie, 10 January 2018
#C period-4094 block automaton XOR oscillators
#C Source:
#C   https://conwaylife.com/forums/viewtopic.php?p=54909#p54909
#C
#C This pattern shows a simulation of high-period XOR oscillators in a
#C Margolus rule, using 2x2 regions in an isotropic non-totalistic
#C (INT) rule. A summary of the Margolus rulespace can be found here:
#C   https://conwaylife.com/wiki/Margolus_neighbourhood
#C
#C In this case, all five possible "Margolus media" actually coexist
#C in a single rule: blocks can be filled, 3/4 filled, 1/2 filled
#C (in two different ways), or 1/4 filled.  Many INT rules can emulate
#C Margolus rules with one or the other of these methods, but rules
#C that allow all of the methods simultaneously are much rarer.
#C
#C As lines are made longer, the oscillator periods change radically,
#C occasionally becoming very large.  See also horiship-guns.rle.
#C
#C Reference for oscillator period lengths:
#C   https://conwaylife.com/forums/viewtopic.php?p=54269#p54269
#C A summary by Arie Paap of of some of the many places where
#C XOR-type oscillators can be found:
#C   https://conwaylife.com/forums/viewtopic.php?p=84994#p84994
#C For various Margolus media, see
#C https://conwaylife.com/forums/viewtopic.php?f=11&t=5204
x = 94, y = 54, rule = B2c3i4i5i/S2c3i4i5iHistory
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