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He continued his mountaineering , going on holiday to the Alps to climb every year from 1894 to 1898 , often with his friend Oscar Eckenstein , and in 1897 he made the first ascent of the Mönch without a guide .
 Alps, Oscar Eckenstein, Mönch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alps, Oscar Eckenstein, Mönch