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On your itinerary -- sea level, Machu Picchu, low altitude, Cuzco -- you do not have to start from scratch in acclimatization after four days at low altitude, but you are far from acclimatized to C...
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On your itinerary -- sea level, Machu Picchu, low altitude, Cuzco -- you do not have to start from scratch in acclimatization after four days at low altitude, but you are far from acclimatized to C...