Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Welsh ef
← Proto-Indo-European *éy (derived)

→ Breton eñ (cognate)
→ Breton eñv (cognate)
→ Welsh o (mention)
→ Welsh o (mention)
→ Welsh i (link)
→ Welsh e (mention)
→ Welsh e (mention)
→ Welsh fo (mention)
→ Welsh efo (compound)
→ Welsh hefo (compound)
→ Welsh efallai (compound)