is applied four times under toric constraints starting from the finite $4 \times 6$ pattern $G$ given by $$G =
\begin{pmatrix}
  b & a & b & a \\
  c & d & c & d \\
  \bar{b} & \bar{a} & \bar{b} & \bar{a} \\
  \bar{a} & \bar{b} & \bar{a} & \bar{b} \\
  d & c & d & c \\
  a & b & a & b
\end{pmatrix}.$$ Here, the difference between $\sigma(a)$ and $\sigma(\bar{a})$ resides in the interchange of the letters $r$ and $w$ in the first 3 rows of the pattern except the last column, and similarly for $\sigma(b)$ and $\sigma(\bar{b})$. This switching between components is exactly the typical dynamical property that we expect for symbolic coding of patterns. For example, the first iteration $\sigma(G)$ yields $$\sigma(G) = \sigma\left(\begin{array}{llllllllllllllll}
  b & a & b & a \\
  c & d & c & d \\
  \bar{b} & \bar{a} & \bar{b} & \bar{a} \\
  \bar{a} & \bar{b} & \bar{a} & \bar{b} \\
  d & c & d & c \\
  a & b & a & b
\end{array}\right) =
\begin{pmatrix}
\sigma(b) & \sigma(a) & \sigma(b) & \sigma(a) \\
\sigma(c) & \sigma(d) & \sigma(c) & \sigma(d) \\
\sigma(\bar{b}) & 