Czech-Slovak languages 

West Slavic
Geographic
distribution:
Eastern Europe
Genetic
classification
:
Indo-European
 Balto-Slavic
  Slavic
   West Slavic
Subdivisions:

     Countries where a West Slavic language is the national language

The West Slavic languages is a subdivision of the Slavic language group that includes Czech, Polish, Slovak, and Sorbian.

Classification:

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