Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*ęčati
→
Czech
ječet
(inherited)
→
Polish
jęczeć
(inherited)
→
Serbo-Croatian
ječati
(inherited)