ABSTRACT
A comb is a simplified model for various types of natural phenomena that belong to the loopless graphs category. The comb consists of a backbone along the horizontal axis and fingers or teeth along the perpendicular direction (see Figure 31.1 for a two-sided comb). Two-sided comb. https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9781315374109/356f9d63-55e3-411c-acbc-de6b560bf29a/content/fig31_1_OC.tif"/>
