Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Jeju
-ㅅ-
←
Middle Korean
-
(cognate)
→
Jeju
이ᄉᆞᆺ밥
(affix)