Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
ti
←
Proto-Brythonic
*tɨɣ
(inherited)
←
Proto-Celtic
*tegos
(inherited)
←
Proto-Indo-European
*(s)teg-
(root)
←
Proto-Indo-European
*(s)teg-
(derived)
→
Breton
arc'hanti
(compound)
→
Breton
eskopti
(compound)