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The topics covered are : Advanced navigation Include articles about piloting and astronavigation : Corrections for sextant altitude , Sight Reduction with calculator-Form & Plotting sheet for celestial LoPs , Celestial Fix - 2 LoPs , Celestial Fix - n LoPs NA Sight Reduction algorithm , Vector equation of the Circle of Position , Vector Solution for the intersection of two Circles of Equal Altitude , Sight Reduction - Matrix solution .
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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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