definitive proof of genetic relationship between Tupi and Japanese
Curitiba < kuri-ty-(sa)b-a pine.nuts-many-place-NOM "place with many pine nuts"
栗 Kuri 'chestnut'
千 Ti 'thousand'
場 Ba 'place'
栗千場 Kuritiba "the place of a thousand nuts"
Proto-Tupi-Japanese was obviously *kuɾitysab, the nominaliser -a became opaque in jp due to loss of closed syllables and ty>ti>tʃi happened independently in both branches (General Tupi, Middle J) as a very common change.
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