Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Polish
sąmnieć
←
Proto-Slavic
*sǫmьněti
(inherited)
←
Old Polish
są
(prefix)
←
Old Polish
mnieć
(prefix)