Where does “[[čtyřie]], [[čtyři]]” come from?

[[čtyřie]], [[čtyři]] (Old Czech) comes from Proto-Slavic četyre, from Proto-Balto-Slavic ketures, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

Ancestry of “[[čtyřie]], [[čtyři]]”, step by step

StepLanguageWordMeaning
1Proto-Slavicčetyrefour
2Proto-Balto-Slavicketuresfour
3Proto-Indo-Europeankʷetwóresfour
4Proto-Indo-Europeankʷe-and

Words derived from “[[čtyřie]], [[čtyři]]”

Every word from Proto-Indo-European kʷe- →Every word from Proto-Indo-European kʷetwóres →Every word from Proto-Balto-Slavic ketures →