säännöllistettyihin
säännöllistettyihin is the illative plural form of the Finnish word "säännöllistetty." This means "regularized" or "made regular." In Finnish grammar, the illative case indicates movement into or within a place, or figuratively, into a state or condition. Therefore, "säännöllistettyihin" literally translates to "into the regularized ones" or "among the regularized ones."
The adjective "säännöllistetty" itself is derived from the verb "säännöllistää," which means "to regularize," "to make
As an illative plural, "säännöllistettyihin" would be used in sentences describing something entering into a state