46972
Generally there are two types of bus service : Regular buses , operating similarly to buses in the city , stop frequently and it takes longer to ride ; commuter express buses , which are dedicated to serve the university town , mainly utilize expressways and have less stops .
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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:
 None