Abstract
This chapter discusses the different intermediate configurations of four-connected nets. The four-connected nets are characterized in three different types namely uninodal tetrahedral nets, uninodal nets with “square planar” nodes, and nets with both tetrahedral and square planar nodes. Hence, it is useful to distinguish between nets based on tetrahedral nodes, squares planar nodes, and those that are a mixture of the two. The sra net contains much distorted tetrahedrons since it is based on four-rings, but it is still the second most common tetrahedral type four connected net formed by interconnected ladders. Only two nets based on square planar units are the lvt net and the somewhat unique tcb. Nets with both tetrahedral and square planar nodes are by definition at least binodal. They consists of three more nets namely the twisted pts, the or, and the asv net. The chapter provides the detailed information of vertex and short symbol, genus, type, motif, and chiral.
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