Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Russian тяжкий
Proto-Indo-European *tengʰ- (root)
Old East Slavic тѧжькъ (inherited)
Proto-Slavic *tęžьkъ (inherited)

Russian пуститься во все тяжкие (mention)
Russian пускаться во все тяжкие (mention)