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It was isolated again by Peter Woulfe in 1767 , by Carl Wilhelm Scheele in 1770 and by Joseph Priestley in 1773 and was termed by him " alkaline air " .
 Peter Woulfe, Carl Wilhelm Scheele, Joseph Priestley
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:
 Peter Woulfe, Carl Wilhelm Scheele, Joseph Priestley