Actually, the case is very practical.
We need to know, which of the tags in DC relate to InterSystems Products and Services.
Every post on DC has a Tags field, which is a comma delimited string, consists of any of 150+ tags.
We need to form a Big Tag field, which is filtered Tags field with only the following values: Caché, Ensemble, HealthShare, Intersystems IRIS, DeepSee, iKnow, Atelier, Online Learning, Documentation, WRC.
E.g. this particular post has Tags: Beginner, Caché