229737
Writings In his early writings between 1919 and 1925 ( his first was 1913 ) , he experimented with numerous historical astrology techniques , including the astrological houses , planetary formulae a + b-c = c similar to Arabic parts , and for a brief period a new scheme of planetary rulerships .
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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