WOLFRAM|DEMONSTRATIONS PROJECT

Neighbor-Dependent Substitution Systems of Two Kinds

​
rule
477
steps
9
A substitution system of two kinds that is neighbor dependent assigns any combination up to two kinds (in this case, two colors), with assignments based on both the state of the cell being substituted and its rightmost neighbor.
There are a total of
4
7
=2401
rules for a neighbor-dependent substitution system of two kinds.