voc.txt was generated from a dump of the Ukrainian Wikipedia like so:

perl -CS scripts/wikipedia-dump-to-freq ukwiki-latest-pages-articles.xml.bz2 10 Cyrillic > voc.freq
scripts/freq-to-voc 300 < voc.freq | grep -v "^'" > ukrainian/voc.txt

The dump used was dated 2025-01-02.

The first command extracts the article text from the dump and counts word
occurrences; the second keeps only words which occur at least 300 times.
This is a frequency list, not article text: no sentence of any article can be
recovered from it.

2 words which occur fewer than 300 times in the dump were added by hand to
cover a reported case (акварельний, акварельні).

output.txt was generated from voc.txt by running it through the stemmer:

stemwords -l ukrainian -c UTF_8 -i ukrainian/voc.txt -o ukrainian/output.txt

Wikipedia is licensed as: https://creativecommons.org/licenses/by-sa/4.0/
(the Wikimedia Terms of Use moved text contributions from CC BY-SA 3.0 to
CC BY-SA 4.0 in June 2023, before the dump date).  To the extent that the
rights in the source text extend to this word list, the list is offered under
the same licence.
