This section describes basic concepts concerning sets and surfaces. The following topics are discussed:
“What is a set?,” Section 48.2.1
“How do part sets and assembly sets differ?,” Section 48.2.2
“What is a surface?,” Section 48.2.3
“Regeneration of geometry sets and surfaces,” Section 48.2.4
“Specifying a particular side or end of a region,” Section 48.2.5
