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LEVEL OF DIFICULTY: On climbing we use the French alpine system : It starts at F (facile or easy), PD(peu difficile or a fairly easy), AD (assez difficile or fairly difficult), D (difficile or difficult), TD (très difficile or very difficult), ED (extrêmement difficile or extremely difficult). They take into consideration: The technical difficulty of the hardest section of the routes which starts at over 5000 m high and acclimatization which is as important as technical ability. In trekking we consider as well those 6 difficulties explained above but we transferred the situation to the activity of the trek. The only remarkable difference exists in the altitude: The true climbing activity starts at over 5000 m high but the trekking activity runs from 1500 m high up to 5150 m high.
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