The aim of the first part of the project, based on Sect. 2.7, is to practice identification of various elements in the model. Count the different elements in the models shown in Fig. 15.1 and complete Table 15.1 with the number of faces, edges, vertices and inner contours. Remember, these are all Eulerian objects, with genus 0 and multiplicity 1. The two contours in object P6 should be considered part of the same object, they have a common face.