Read MoreTill now, K2 was the only mountain higher than 8,000m not to be conquered in winter.Till now, K2 was the only mountain higher than 8,000m not to be conquered in winter.

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Read MoreTill now, K2 was the only mountain higher than 8,000m not to be conquered in winter.Till now, K2 was the only mountain higher than 8,000m not to be conquered in winter.