Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latgalian
seši
←
Proto-Balto-Slavic
*šéš
(inherited)
←
Proto-Indo-European
*swéḱs
(inherited)
←
Lithuanian
šeši
(cognate)
←
Latvian
seši
(cognate)