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Alfred Watkins , in his classic work on ley lines " The Old Straight Track " , used the width of a pencil line on a map as the threshold for the tolerance of what might be regarded as an alignment .
 Alfred Watkins
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alfred Watkins