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Although the steep sides of the plateau make it difficult to access , it was the first recorded major tepui to be climbed : Sir Everard im Thurn walked up a forested ramp on 18 December 1884 to scale the plateau , the route also used by the Clementis in their climb of 15 January 1916 .
 Everard im Thurn, Clementis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Everard im Thurn, Clementis