Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Tocharian B
ek
←
Proto-Indo-European
*okʷs
(derived)
←
Proto-Indo-European
[[*h₃okʷ-]], [[*h₃ekʷ-]]
(mention)
←
Proto-Tocharian
*ëk
(derived)
←
Tocharian A
ak
(cognate)
→
Tocharian A
ak
(cognate)