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× 5 mountaineers to attempt extreme winter ascent of Everest

KATHMANDU --Five mountaineers are on a daring mission to make a rare and extreme winter ascent of Everest without oxygen for the first time in nearly three decades.

Krzysztof Wielicki of Poland first climbed the world's tallest peak in the dead of winter on February 17, 1980. Ang Rita Sherpa, known by the epithet of Snow Leopard, has climbed Everest 10 times without using supplemental oxygen, and…