224829
At the outset of the war , searchlights were combined with acoustic direction-finders , with the direction-finders guiding the searchlights to the right part of the sky , where they swept until they found the target .
 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