Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
siedem
←
Proto-Indo-European
*septḿ̥
(mention)
←
Proto-Slavic
*sedmь
(inherited)
←
Proto-Slavic
*setь
(mention)
→
Latvian
septiņi
(cognate)
→
Polish
siedmioro
(affix)
→
Polish
siedmiokroć
(affix)
→
Polish
siedmiolatek
(affix)