Figure 2
From: The extremal pentagon-chain polymers with respect to permanental sum

An edge-ortho-pentagon-chain \(EPC^{o}_{n}\) and an edge-meta-pentagon-chain \(EPC^{m}_{n}\).
From: The extremal pentagon-chain polymers with respect to permanental sum

An edge-ortho-pentagon-chain \(EPC^{o}_{n}\) and an edge-meta-pentagon-chain \(EPC^{m}_{n}\).