Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Catalan
espill
←
Catalan
espècul
(doublet)
←
Spanish
espejo
(cognate)
←
Latin
speculum
(inherited)
←
Occitan
espill
(cognate)
←
Old Occitan
(inherited)
→
Catalan
espècul
(doublet)