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In particular , pairwise summation of a sequence of n numbers xn works by recursively breaking the sequence into two halves , summing each half , and adding the two sums : a divide and conquer algorithm .
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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:
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