88131
During its short operational service , mostly under the Repubblica Sociale Italiana insignia , after the 8 September 1943 armistice , this powerful , robust and fast aircraft proved itself to be an excellent interceptor at high altitude .
 Repubblica Sociale Italiana
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Repubblica Sociale Italiana