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History The term high definition once described a series of television systems originating from August 1936 ; however , these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution .
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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:
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