#Life 1.05
#R 012345678/3
#D One seed of size 8 which gives birth to a ladder.
#D (The pentomino piece actually spawns a two-sided ladder, and
#D then interaction with the other three cells kills its left branch.)
#D 
#D Note that the ladder's horizontal spatial periodicity is 4.
#D In fact, the head cycles through 12 distinct patterns in order
#D to weave its periodic pattern, the last 6 of which are vertical
#D flips of the first 6.
#D 
#D David Griffeath and Cris Moore 
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