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FUNCTIONS OF GCAA UNDER 678Under the GCAA Act 678 , the functions of GCAA include the following : • Licensing and Certification of Air Transport Operators • Licensing and Certification of Aerodrome s and the Construction , Operation , Maintenance and Managements of Navigation Sites .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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