8419
As well as his contacts with people mentioned elsewhere in the article , he also maintained correspondence with Henri Bergson , William M. Brown , Martin Buber , George S. Counts , William Rainey Harper , Sidney Hook , and George Santayana .
 person: Henri Bergson; person: William M. Brown; person: Martin Buber; person: George S. Counts; person: William Rainey Harper; person: Sidney Hook; person: George Santayana
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Henri Bergson; person: William M. Brown; person: Martin Buber; person: George S. Counts; person: William Rainey Harper; person: Sidney Hook; person: George Santayana