Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
grudzień
←
Proto-Slavic
*grudьnъ
(inherited)
←
Proto-Slavic
*gruda
(mention)
←
Proto-Slavic
*-ьnъ
(mention)
→
Polish
grudniowy
(affix)
→
Polish
Grudzień
(mention)
→
Russian
грудень
(cognate)