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Primary-phase missions Three SMEX missions are currently funded for their primary missions : Nuclear Spectroscopic Telescope Array ( NuSTAR ) , Aeronomy of Ice in the Mesosphere ( AIM ) and Interstellar Boundary Explorer ( IBEX ) .
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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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