Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
per
←
Breton
gwez-per
(link)
←
Breton
per-douar
(link)
←
Breton
pereg
(link)
←
Breton
perenn
(link)
←
Breton
perenneg
(link)
←
Breton
perennek
(link)
←
Breton
perid
(link)
←
Breton
sistr per
(link)
←
Breton
chaoudouron
(link)
←
Breton
kaoter
(link)
←
Breton
pothouarn
(link)
←
Proto-Brythonic
*per
(inherited)
←
Welsh
pêr
(cognate)
←
Welsh
pair
(cognate)
←
Cornish
per
(cognate)
←
Cornish
per
(cognate)
←
Latin
pira
(derived)
←
Latin
pirum
(mention)
←
Middle Breton
per
(inherited)
→
Welsh
pêr
(cognate)
→
Cornish
per
(cognate)