Figure 6
From: The extremal pentagon-chain polymers with respect to permanental sum

A vertex-ortho-pentagon-chain \(VPC^{o'}_{n}\) and a vertex-meta-pentagon-chain \(VPC^{m'}_{n}\).
From: The extremal pentagon-chain polymers with respect to permanental sum

A vertex-ortho-pentagon-chain \(VPC^{o'}_{n}\) and a vertex-meta-pentagon-chain \(VPC^{m'}_{n}\).