Liityivät
Liityivät is a Finnish word, a past tense plural form of the verb "liittyä." It translates to "joined," "connected," or "associated." The verb "liittyä" itself encompasses a range of meanings, from physically attaching oneself to something or someone, to becoming part of a group or organization, or even establishing a relationship or connection.
In its plural past tense form, "liityivät" indicates that multiple subjects performed the action of joining