4441
These were discovered , but not published , by Charles Sanders Peirce around 1880 , and rediscovered independently and published by Henry M. Sheffer in 1913 .
 person: Charles Sanders Peirce; person: Henry M. Sheffer
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:
 person: Charles Sanders Peirce; person: Henry M. Sheffer