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Egyptians used metal chisels and hoes to mine and made tubular shafts with footholds in the walls to move down as far as 30 meters to reach the copper , all revolutionary methods for the time .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None