Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
rhag-
←
Welsh
rhag
(mention)
←
Cornish
rag-
(cognate)
←
Cornish
rak-
(cognate)
→
Welsh
Rhagfyr
(affix)
→
Welsh
rhaglen
(affix)
→
Welsh
rhagddodiad
(affix)
→
Welsh
rhagenw
(affix)
→
Welsh
rhagrith
(affix)
→
Welsh
rhagfur
(affix)
→
Welsh
rhagolwg
(affix)
→
Welsh
rhagorsaf
(compound)