Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Finnish -ksi
← Proto-Finnic *-ksi (inherited)
← Moksha -кс (cognate)
← Erzya -кс (cognate)

→ Finnish jätän päätettäväksi (mention)
→ Finnish -ksua (affix)
→ Moksha -кс (cognate)
→ Northern Sami -s (mention)