27220
A small parabolic dish was added to the rear of the prop 's casing to explain why these Daleks , unlike the ones in their first serial , were not dependent on static electricity drawn up from the floors of the Dalek city for their motive power .
 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