Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Polish
jeno
←
Czech
jenom
(cognate)
←
Czech
jen
(mention)
←
Proto-Slavic
*jenъ
(inherited)
→
Czech
jenom
(cognate)