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

→ Czech zrcadlo (inherited)
→ Old Church Slavonic зрьцало (inherited)
→ Polish zwierciadło (inherited)
→ Russian зерцало (inherited)
→ Serbo-Croatian zrcalo (inherited)
→ Serbo-Croatian зрцало (inherited)
→ Old Czech zrcadlo (inherited)