Ruthenian

Deductions

• dead language is for example Ruthenian ⇐ (Ruthenian is a dead language), (is a is inverse of is for example)
• Ruthenian is subclass of Indo-European ⇐ (Ruthenian is subclass of Balto-Slavic), (Balto-Slavic is subclass of Indo-European), (is subclass of is a transitive relation)
• Ruthenian is subclass of Balto-Slavic ⇐ (Ruthenian is subclass of Slavic), (Slavic is subclass of Balto-Slavic), (is subclass of is a transitive relation)
• Ruthenian is subclass of Slavic ⇐ (Ruthenian is subclass of East Slavic), (East Slavic is subclass of Slavic), (is subclass of is a transitive relation)