3964
As a result , between 1960 and 1964 , " Lassie " s ratings greatly improved and by the spring of 1964 , it received its highest rating ever , ranking at # 13 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None