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The classic 19th century Franz Simandl method does not use the low E string in higher positions because older gut strings , set up high over the fingerboard , could not produce clear tone in these higher positions .
 Franz Simandl
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Franz Simandl