Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Esperanto duobla
Esperanto du (affix)
Esperanto -obla (affix)

Esperanto duobligi (affix)
Esperanto duobliĝi (affix)
Esperanto duobla vo (link)
Esperanto duobla konsonanto (mention)
Esperanto duoblingo (mention)