This is the 465th most frequent Finnish word.
kuuluvat
"Kuuluvat" means "they belong" or "are part of."
Here, 'kuuluvat' is used to indicate inclusion or belonging to a group or category.
He kuuluvat samaan perheeseen.
They belong to the same family.
Here, 'kuuluvat' denotes possession or association with an entity or place.
Kirjat kuuluvat kirjastolle.
The books belong to the library.
In this sentence, 'kuuluvat' expresses association with a category characterized by a certain property—in this case, scarcity.