Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
axuda
←
Asturian
axuda
(cognate)
←
Spanish
ayuda
(cognate)
←
Galician
axudar
(back-formation)
←
Galician
axudar
(link)
←
Portuguese
ajuda
(cognate)
←
Old Portuguese
ajuda
(inherited)