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About 1760 , the family moved to nearby Grubb 's mill , and about 1768 , they moved to neighboring East Whiteland Township in the Great Valley of Pennsylvania where , in 1770 , Thomas Harris bought a farm just inside the Welsh Tract .
 East Whiteland Township, Pennsylvania, Harris
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 East Whiteland Township, Pennsylvania, Harris