pääaiheina
Pääaiheina is a Finnish word that translates to "as main topics" or "with main subjects" in English. It is commonly used to introduce or list the primary subjects or themes that will be discussed, presented, or focused upon. The word itself is a plural adessive form of "pääaihe," which means "main topic" or "main subject." The adessive case in Finnish typically indicates possession, accompaniment, or the instrument by which something is done, but in this context, it functions more like "concerning" or "with regard to."
When "pääaiheina" is used, it signals to the reader or listener that the following information will constitute