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Die Empfehlung von Groundspeak zur T-Wertung:
T 4 Very strenuous movement that may include significant distance, overgrowth, swimming, or elevation changes.
T 4,5 Extremely difficult. Most likely requires special knowledge or skills. Extremely 5 Extremely demanding movement over potentially hazardous terrain.
T 5 The most extreme mental challenge. Requires specialized knowledge, skills, tools, ... Requires specialized equipment such as scuba gear, a boat, rock climbing gear, or similar.
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