Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Czech sedm
← Proto-Indo-European *septḿ̥ (derived)
← Proto-Slavic *sedmь (inherited)
← Proto-Slavic *setь (mention)

→ Czech sedmdesát (affix)
→ Czech sedmero (mention)
→ Czech sedmina (affix)
→ Czech sedmitisícovka (affix)
→ Latvian septiņi (cognate)