Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Church Slavonic
тѧѕати
→
Old Church Slavonic
сътѧѕати
(prefix)
→
Old Church Slavonic
истѧѕати
(prefix)