Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
trydydd
←
Proto-Brythonic
*trɨdɨð
(inherited)
←
Proto-Celtic
*tritiyos
(inherited)
→
Welsh
trydydd ar ddeg
(compound)
→
Welsh
trydydd ar hugain
(compound)
→
Welsh
trydedd ar hugain
(compound)