157520
Usage PITCHf/x is a system using two 60 Hz cameras mounted in the stadium to track the speed and location of a pitched baseball from the pitcher 's mound to home plate with an accuracy of better than one mile per hour and one inch .
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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