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Klara Roumianova
Ivan Semenov (voice)
Тамара Дмитриева
Ivan's classmate (voice)
Антонина Дмитриева
The teacher (voice)
Михаил Яншин
First doctor (voice)
Анатолий Папанов
Second doctor (voice)
Георгий Вицин
Third doctor (voice)
