Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Tocharian B
ṣer
←
Proto-Indo-European
*swésōr
(inherited)
←
Proto-Tocharian
*ṣäṣer
(inherited)
←
Tocharian A
ṣar
(cognate)
→
Tocharian A
ṣar
(cognate)