Fig. 1. B₁ is a good matrix. B₂ is not a good matrix for two reasons: the two consecutive bold 1's in the second row contradict the read restriction and the bold 2×2 submatrix in the lower right corner contradicts the write restriction.

Fig. 2. The transfer matrices A₁, A₂, A₃, A₄.

Fig. 3. The horizontal transfer matrices , , and associated matrices B₁, B₂ and B₃.

Table 1. F_k is the kth Fibonacci number. λ_k is the largest eigenvalue of the F_k+2×F_k+2 transfer matrix A_k. The λ_k values are from Table 1 in [4]

Table 2. μ_r is the largest eigenvalue of the 2^r×2^r transfer matrix Not-found_r