Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Danish
gen-
←
Danish
igen
(mention)
←
Norwegian Bokmål
gjen-
(cognate)
←
Old Norse
gegn
(mention)
→
Danish
gentage
(prefix)
→
Danish
gavn
(cognate)
→
Danish
gensyn
(prefix)
→
Danish
genfødsel
(prefix)
→
Danish
genvælge
(prefix)
→
Danish
genudsende
(prefix)
→
Danish
genvalg
(affix)
→
Danish
gengæld
(affix)
→
Norwegian Bokmål
gjen-
(cognate)
→
Swedish
gen-
(cognate)