Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
trzemcha
←
Polish
czeremcha
(doublet)
←
Proto-Slavic
*čermъxa
(inherited)
→
Polish
czeremcha
(doublet)