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HighFlock is a Life-like cellular automaton with rulestring B36/S12, one outer-totalistic transition away from Flock. In this rule, cells survive from one generation to the next if they have 1 or 2 neighbours, and are born if they have 3 or 6 neighbours.
There are known spaceships of speeds[1] c/3, c/4, c/5 (and a natural 3c/15 thereof), 2c/5 (and glide-symmetric 4c/10), c/4d, c/6d and a 2c/8d in common with Flock.
Spaceships of known speeds (click above to open LifeViewer)
In outer-totalistic rules of the form B3(45678)/S12(678), where outer-totalistic transitions given in parentheses are optional, c/2 orthogonal spaceships may not exist.[citation needed]
In those of the form B3(4678)/S123(678), spaceships of speed c/3d may not either.[citation needed]
Linear growth
Orthogonal
Unstabilised, the 2c/5 engine is a puffer of stable dominoes. There are two known 2c/5 domino-trail eaters, that may stabilise it into an extensible spaceship.