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In the Royal Canadian Navy , the rank of Lieutenant ( Navy ) ( Lt ( N ) ) ( ) is the naval rank equal to Captain in the army or air force .
 Royal Canadian Navy, army, air force
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Canadian Navy, army, air force