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There are 40 trails totaling nearly in the wilderness that can be used for day hiking , backpacking , and horseback riding and accessed from 23 trailheads .
 horseback riding
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 horseback riding