Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Polish
czso
←
Proto-Slavic
*čьso
(inherited)
←
Proto-Slavic
*česo
(mention)
←
Proto-Slavic
*čьto
(mention)