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There are seven official wilderness areas lying within San Bernardino National Forest that are part of the National Wilderness Preservation System .
 San Bernardino National Forest, National Wilderness Preservation System
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 San Bernardino National Forest, National Wilderness Preservation System