Please, are there language codes for Old Indic, Avestan, Old Church Slavonic, Old Norse, Old English, Old High German, Phyrgian, Hittite, Luwian...? Where does one find them?
I was rather hoping for some comprehensive label on the lines of xml:lang="exclude" / "none" / "PIE", that would deal with all those bits--some are only roots: 'xxx-'
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