Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
obeutu
←
Breton
bemdez
(cognate)
←
Welsh
o
(compound)
←
Welsh
peutu
(compound)
←
Welsh
beu-
(mention)
←
Welsh
beunydd
(mention)
←
Welsh
pob
(mention)
←
English
about
(derived)
→
Breton
bemdez
(mention)