Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
logar
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English
log in
(link)
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loguear
(cognate)
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Portuguese
log in
(affix)
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Portuguese
-ar
(affix)
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Spanish
loguear
(cognate)