You can never understand one language until you understand at least two.
The Language Database
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isoledted languages
Some languages cannot be classified under
any group and seem to have developed independently from other
languages. These so-called isolated languages are:
Ainu, Basque, Burusjaski, Elamitic, Etruskian, Iberian, Japanese, Keresan,Korean,
Kusanda, Sumerian