perustalliset
Perustalliset is a Finnish term that does not have a single, widely accepted meaning in standard Finnish. It is rare in dictionaries and in formal writing, and when it appears its meaning is usually ambiguous or context-dependent. Because of this, the term is typically interpreted from the surrounding text rather than from a fixed definition.
The word appears to be a compound built from perusta, meaning foundation or basis, and a suffix
In practice, some writers might use perustalliset in a metaphorical way to mean “fundamental elements” or “basics”
Guidance for readers and translators: rely on context to infer meaning; where possible, prefer standard Finnish