Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Old English ed-
German it- (cognate)
Proto-Germanic *idi- (inherited)
Old High German id- (cognate)
Old High German ida- (mention)
Gothic 𐌹𐌳- (cognate)
Old Norse ið- (cognate)
Old Saxon idug- (cognate)

English eddy (mention)
English ed- (inherited)
Old English edwenden (affix)
Old English edstaþelig (affix)
Old English edlesendlic (affix)
Old English edlæcung (affix)
Old English edlæcan (prefix)
Old English edniewe (affix)
Old English edniewan (affix)
Latin et (mention)