Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Occitan
oc
←
Old French
oil
(cognate)
←
Old French
o
(mention)
←
Latin
hoc
(inherited)
→
Old French
oil
(cognate)
→
Occitan
hoc
(inherited(oc/ca))
→
Occitan
òc
(inherited)