After performing the extraction command, (the Post-Assignments part / Post-Assignments) of each rule is / are carried out. Similar to Pre-Assignments, they may update or set some variables in the Vars list.
Each rule consists of some parts which are called, extraction command, pre-assignments, post assignments, etc. I don't know how to treat these names. Can I use for example, pre-assignments the way I use assignments? or the extraction command, the way I use command? When to use part after them and when to use them as single noun?