This is the 167th most frequent Slovenian word.
nekaterih
"Some" or "of some" (genitive plural form).
Here, 'nekaterih' refers to 'some' countries, denoting an indefinite subset of 'countries'.
V nekaterih državah uporabljajo drugačen jezikovni sistem.
In some countries, they use a different language system.
Here, 'nekaterih' specifies 'some' problems, indicating a part of the whole group of 'problems'.
Nekaterih težav ni mogoče rešiti brez pomoči.
Some problems cannot be solved without assistance.
Here, 'nekaterih' modifies 'rules,' referring to a specific, indefinite part of all possible 'rules'.