Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Batak
*babuy
→
Toba Batak
babi
(inherited)
→
Simalungun Batak
babui
(inherited)
→
Karo Batak
babi
(inherited)