Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Tocharian B
keme
←
Proto-Indo-European
*ǵómbʰos
(derived)
←
Proto-Tocharian
*keme
(derived)
←
Tocharian A
kam
(cognate)
→
English
comb
(cognate)