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Yakov G. Sinai was born on 1935-09-21.
Yakov Kreizberg's birth name is Yakov Bychkov.
Yakov Malik's birth name is Malik, Yakov Alexandrovich.
Yakov Smolenskiy's birth name is Yakov Mikhaylovich Smolenskiy.
Yakov Segel's birth name is Segel, Yakov Aleksandrovich.