Syntactically (in patterns of word arrangement) and
morphologically (in systems of word formation), the similarity
between the Korean and Japanese languages was very much
strengthened. However, the lexical and phonological influence
of the Ainu and Malayo-Polynesian languages cast a long
shadow on the subsequent evolution of the Japanese language.
Therefore, by the early ninth century at the latest, due to ever
increasing lexical, semantic (in meaning) and phonological
differences, the people of the Korean peninsula and the people
of the Japanese islands could no longer directly communicate
with each other without interpreters.
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