Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Proto-Slavic *esmъ

→ Serbo-Croatian nijesmo (mention)
→ Serbo-Croatian nismo (mention)
→ Serbo-Croatian nesmo (mention)
→ Serbo-Croatian несмо (mention)
→ Serbo-Croatian нијесмо (mention)
→ Serbo-Croatian нисмо (mention)
→ Old Novgorodian есме (inherited)