Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latgalian
treis
←
Proto-Balto-Slavic
*tríjes
(inherited)
←
Lithuanian
trys
(cognate)
←
Latvian
trīs
(cognate)