Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
contúirt
←
Proto-Celtic
*kon-to-bart
(inherited)
←
Proto-Celtic
*kom
(mention)
←
Proto-Celtic
*to
(mention)
←
Proto-Celtic
*bereti
(mention)
←
Middle Irish
cunntabhart
(inherited)
←
Old Irish
cuntabart
(inherited)
→
Irish
cuntar
(mention)