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The prototype , which was an amphibian with a retractable wheeled undercarriage which swung forward into streamlined casings in the leading edges of the wing s , was powered by two Wright SGR-1820-F Cyclone nine-cylinder air-cooled radial engine s mounted above the wing , each driving a tractor propeller .
 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