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Helped develop the first Russian hydrogen bomb
Helped develop the first Russian hydrogen bomb, 8 letters, 1st letter S
Helped develop the first Russian hydrogen bomb, 8 letters, 2nd letter A
Helped develop the first Russian hydrogen bomb, 8 letters, 3rd letter K
Helped develop the first Russian hydrogen bomb, 8 letters, 4th letter H
Helped develop the first Russian hydrogen bomb, 8 letters, 5th letter A
Helped develop the first Russian hydrogen bomb, 8 letters, 6th letter R
Helped develop the first Russian hydrogen bomb, 8 letters, 7th letter O
Helped develop the first Russian hydrogen bomb, 8 letters, 8th letter V
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