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Traditionally it has been viewed as a part of nature 's renewable energy cycle , harvested once a year at the break of spring when birch trees awaken after winter dormancy and their sap begins to flow from tree root to tree tip .
 None
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