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Belarusian пісьмо (inherited)→
Bulgarian писмо (inherited)→
Czech písmo (inherited)→
Old Church Slavonic писмѧ (inherited)→
Macedonian писмо (inherited)→
Polish pismo (inherited)→
Russian письмо (inherited(ru/uk))→
Serbo-Croatian pismo (inherited)→
Serbo-Croatian писмо (inherited)→
Slovene pismo (inherited)