Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Serbo-Croatian
ako
←
Proto-Slavic
*jako
(inherited)
→
Serbo-Croatian
kad
(mention)
→
Serbo-Croatian
akoprem
(mention)
→
Slovene
ko
(cognate)