helyszínei
Helyszínei is a Hungarian term used to refer to multiple sites or locations associated with a subject. In ordinary language, the basic plural of helyszín is helyszínek, but helyszínei appears in specific grammatical contexts to denote the locations belonging to or connected with something, or to list the locations of a project, event, or study.
The word is most common in formal or technical writing, such as urban planning, geography, archaeology, film
Notably, in everyday Hungarian the standard plural is helyszínek. Helyszínei tends to appear in written planning
Etymology-wise, helyszínei is formed from helyszín (site, location) with suffixes that modify it to indicate multiple