This is the 722nd most frequent Slovenian word.
ene
The Slovenian word "ene" is a form of the numeral "one" (feminine plural genitive/dative/locative case).
The word 'ene' here is used as an indefinite article, suggesting an unspecified or particular pair of shoes.
Kupujem ene čevlje.
I am buying some shoes.
In this context, 'ene' specifies an unidentified set of keys, implying they are not distinctly recognized by the speaker.
Na mizi so ene ključi, ki niso moji.
There are some keys on the table that are not mine.
Here, 'ene' contrasts between known and undefined pants in a choice context.