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The 28 cylinder four-row radial engines were still suffering teething problems ; if the proposed engines did become available , their production was completely committed to other large aircraft programs including the B-29 Superfortress and F2G Corsair .
 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