In order to provide scope for discussing the more nuanced details of the formalism, we examine two chemical systems (neutral free-base subporphyrin and H2[MO3], where M can be many elements) that are equally described as 𝒮 3 ℬ 2 , and triphyrin[2.2.2] which is partitioned as 𝒮 3 ℬ 3 where the number of bonders that can connect to any site is limited to 2, which we write as 𝒮 3(2) ℬ 3 .