Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Old Saxon ōk

→ German Low German ok (inherited)
→ Old Norse ok (cognate)
→ Old Norse auk (cognate)
→ Old Norse ᛅᚢᚴ (cognate)
→ Old Frisian ak (cognate)