Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Welsh allt
← Proto-Celtic *altos (inherited)
← Irish ailt (cognate)
← Middle Irish alt (cognate)
← Middle Welsh allt (inherited)

→ Breton aod (cognate)
→ Irish ailt (cognate)
→ Italian alto (cognate)
→ Cornish als (cognate)