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layers

layer 1

state * alive
become dead on 4 alive
become dead on 7 dead
state   dead
become alive on 3 alive and 5 dead

layer 2

s turns to state
b turns to become
o turns to on
a turns to and

layer 3

before is
middle is turns to
after is

layer 4

b turns to before
m turns to middle
a turns to after
i turns to is

layer 5

before is
middle is turns to
after is