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In 1971 , an improved task priority system for computerized telephone exchange switching systems for telephone traffic was invented by Erna Schneider Hoover , who received one of the first software patents for it .
 Erna Schneider Hoover
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Erna Schneider Hoover