293
The propellant reserves were reduced and the number of retrorockets on the S-IC first stage ( used to separate the spent first stage from the S-II second stage ) reduced from eight to four .
 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