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russia × 350soviet-union × 57
military × 30
world-war-two × 21
united-states × 20
20th-century × 20
19th-century × 20
18th-century × 20
kamchatka × 19
world-war-one × 18
russian-revolution × 18
poland × 17
japan × 15
colonization × 14
naval × 12
colonial-america × 12
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communism × 11
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war × 10
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europe × 8