Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Rwanda-Rundi
amate
←
Proto-Bantu
*màtáì
(inherited)
←
Rwanda-Rundi
amata
(doublet)
→
Rwanda-Rundi
amata
(doublet)