## Kolakoski-(3,1) variant A, with dual

### Info

The substitution $a \rightarrow bcc, b \rightarrow ba, c \rightarrow bc$
is a member of the MLD class of the Kolakoski-(3,1) sequence.
As the reversed substitution
generates the same hull, it is mirror symmetric. The scaling factor
$\lambda \approx $ 2.20557 is the largest root of $x^3-2x^2-1=0$.

This substitution has a simple dual,
with three mildly fractal tiles, which are all similar to each other.
The dual substitution scales by about 1.485, and rotates clockwise by
about 81.22°.

### Dual Substitution Rule

### Dual Patch