(documentationpreventsSubclassEnglishLanguage "A very general Predicate. (preventsSubclass ?PROC1 ?PROC2) means that ?PROC1 preventsSubclass the occurrence of ?PROC2. In other words, if ?PROC1 is occurring in a particular time and place, ?PROC2 cannot occur at the same time and place. For example, innoculating preventsSubclass contracting disease. Note that this is a relation between types of Processes, not between instances.")