2677
The complete system comprised 1,050 vacuum tubes of 5 different types and 18,000 crystal diodes , but the computer proper used only 420 6AN5 tubes and 15,000 diodes .
 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