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Sometimes rings will have " " shepherd " " " moons " , small moons that orbit near the inner or outer edges of rings or within gaps in the rings .
 astronomical object: " " shepherd " " " moons "; astronomical object: moons
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: " " shepherd " " " moons ", moons 
Answer:
 astronomical object: " " shepherd " " " moons "; astronomical object: moons