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For example , collapse caves , small hole-like cavities ( honeycomb weathering ) with hourglass-shaped pillars ( " Sanduhr " ) , chimneys , crevices and mighty , rugged rock faces .
 Sanduhr
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sanduhr