Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*blъxà
→
Upper Sorbian
tcha
(inherited)
→
Polabian
blåxă
(inherited)
→
Serbo-Croatian
бувљак
(inherited)
→
Silesian
błecha
(inherited)