icu4c/source/data/coll/bg.txt

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
bg{
    Version{"2.1.19.14"}
    collations{
        standard{
            Sequence{"[reorder Cyrl]"}
            Version{"35.1"}
        }
    }
}